{
  "title": "Collecting Data (Data Handling) - Grade 6 CBSE",
  "total_questions": 60,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "What is the first step in data handling?", "options": {"A": "Collecting data", "B": "Drawing graphs", "C": "Analyzing data", "D": "Making tables"}, "correct_answer": "A"},
    {"id": 2, "difficulty": "easy", "question": "What do we call information collected for analysis?", "options": {"A": "Facts", "B": "Data", "C": "Numbers", "D": "Statistics"}, "correct_answer": "B"},
    {"id": 3, "difficulty": "easy", "question": "Which is an example of data collection?", "options": {"A": "Reading a story", "B": "Drawing a picture", "C": "Counting students in class", "D": "Solving math problems"}, "correct_answer": "C"},
    {"id": 4, "difficulty": "easy", "question": "What is a survey?", "options": {"A": "A type of graph", "B": "A math operation", "C": "A way to collect data", "D": "A measuring tool"}, "correct_answer": "D"},
    {"id": 5, "difficulty": "easy", "question": "Why do we collect data?", "options": {"A": "All of these", "B": "To make decisions", "C": "To understand patterns", "D": "To get information"}, "correct_answer": "A"},
    {"id": 6, "difficulty": "easy", "question": "What is primary data?", "options": {"A": "Data from books", "B": "Old data", "C": "Simple data", "D": "Data collected firsthand"}, "correct_answer": "B"},
    {"id": 7, "difficulty": "easy", "question": "What is secondary data?", "options": {"A": "Less important data", "B": "Data collected by others", "C": "Numerical data", "D": "Colorful data"}, "correct_answer": "C"},
    {"id": 8, "difficulty": "easy", "question": "Which is primary data collection?", "options": {"A": "Reading a newspaper report", "B": "Looking at census data online", "C": "Watching a documentary", "D": "Asking classmates their favorite color"}, "correct_answer": "D"},
    {"id": 9, "difficulty": "easy", "question": "What is a questionnaire?", "options": {"A": "Set of questions for a survey", "B": "A math formula", "C": "A type of graph", "D": "A data table"}, "correct_answer": "A"},
    {"id": 10, "difficulty": "easy", "question": "What should be clear in a survey question?", "options": {"A": "All of these", "B": "Purpose", "C": "Options", "D": "Language"}, "correct_answer": "B"},
    {"id": 11, "difficulty": "easy", "question": "What is observation method?", "options": {"A": "Asking questions", "B": "Watching and recording", "C": "Reading books", "D": "Guessing answers"}, "correct_answer": "C"},
    {"id": 12, "difficulty": "easy", "question": "What is sampling?", "options": {"A": "Studying part of a population", "B": "Testing food", "C": "Drawing pictures", "D": "Writing reports"}, "correct_answer": "D"},
    {"id": 13, "difficulty": "easy", "question": "What is population in data collection?", "options": {"A": "Sample size", "B": "Total group being studied", "C": "Number of people in a country", "D": "Data points"}, "correct_answer": "A"},
    {"id": 14, "difficulty": "easy", "question": "What should data be?", "options": {"A": "Relevant", "B": "Accurate", "C": "Organized", "D": "All of these"}, "correct_answer": "B"},
    {"id": 15, "difficulty": "easy", "question": "What is a data source?", "options": {"A": "Where data comes from", "B": "Survey method", "C": "Type of graph", "D": "Analysis tool"}, "correct_answer": "C"},
    {"id": 16, "difficulty": "easy", "question": "What is recording data?", "options": {"A": "Writing down collected information", "B": "Drawing graphs", "C": "Analyzing results", "D": "Making predictions"}, "correct_answer": "D"},
    {"id": 17, "difficulty": "easy", "question": "What is organizing data?", "options": {"A": "Arranging in order", "B": "Grouping items", "C": "Making tables", "D": "All of these"}, "correct_answer": "A"},
    {"id": 18, "difficulty": "easy", "question": "What is a tally mark?", "options": {"A": "A type of graph", "B": "A survey question", "C": "A data table", "D": "A way to count"}, "correct_answer": "B"},
    {"id": 19, "difficulty": "easy", "question": "How do we write 5 in tally marks?", "options": {"A": "||||", "B": "||||/", "C": "////", "D": "/////"}, "correct_answer": "C"},
    {"id": 20, "difficulty": "easy", "question": "What is a frequency table?", "options": {"A": "Table of multiplication", "B": "Time table", "C": "Price table", "D": "Table showing how often values occur"}, "correct_answer": "D"},

   
    {"id": 21, "difficulty": "medium", "question": "What is random sampling?", "options": {"A": "Equal chance for all", "B": "Choosing friends", "C": "Choosing first people", "D": "Picking favorites"}, "correct_answer": "A"},
    {"id": 22, "difficulty": "medium", "question": "What is stratified sampling?", "options": {"A": "Dividing population into groups", "B": "Random selection", "C": "Convenience sample", "D": "Taking all members"}, "correct_answer": "B"},
    {"id": 23, "difficulty": "medium", "question": "What is systematic sampling?", "options": {"A": "Choosing at intervals", "B": "Random selection", "C": "Choosing best samples", "D": "Taking volunteers"}, "correct_answer": "C"},
    {"id": 24, "difficulty": "medium", "question": "What is cluster sampling?", "options": {"A": "Individual random selection", "B": "Selecting groups randomly", "C": "Convenient groups", "D": "Taking all clusters"}, "correct_answer": "D"},
    {"id": 25, "difficulty": "medium", "question": "What is convenience sampling?", "options": {"A": "Random selection", "B": "Convenient subjects", "C": "Stratified selection", "D": "Systematic selection"}, "correct_answer": "A"},
    {"id": 26, "difficulty": "medium", "question": "What is a census?", "options": {"A": "Entire population data", "B": "Sample survey", "C": "Quick count", "D": "Estimate"}, "correct_answer": "B"},
    {"id": 27, "difficulty": "medium", "question": "What is bias in data collection?", "options": {"A": "Neither", "B": "Favoring outcomes", "C": "Systematic error", "D": "Both"}, "correct_answer": "C"},
    {"id": 28, "difficulty": "medium", "question": "What is a closed-ended question?", "options": {"A": "Open answer", "B": "Fixed choices", "C": "Complex question", "D": "Simple question"}, "correct_answer": "D"},
    {"id": 29, "difficulty": "medium", "question": "What is an open-ended question?", "options": {"A": "Allows free answer", "B": "Fixed options", "C": "Yes/no", "D": "MCQ"}, "correct_answer": "A"},
    {"id": 30, "difficulty": "medium", "question": "What is a Likert scale?", "options": {"A": "Rating scale", "B": "Measuring scale", "C": "Weight scale", "D": "Color scale"}, "correct_answer": "B"},
    {"id": 31, "difficulty": "medium", "question": "What is data validation?", "options": {"A": "Analyzing data", "B": "Checking accuracy", "C": "Collecting data", "D": "Presenting data"}, "correct_answer": "C"},
    {"id": 32, "difficulty": "medium", "question": "What is data cleaning?", "options": {"A": "Washing data", "B": "Removing errors", "C": "Organizing data", "D": "Analyzing data"}, "correct_answer": "D"},
    {"id": 33, "difficulty": "medium", "question": "What is a pilot survey?", "options": {"A": "Airplane survey", "B": "Main survey", "C": "Small test survey", "D": "Final survey"}, "correct_answer": "C"},
    {"id": 34, "difficulty": "medium", "question": "What is response rate?", "options": {"A": "Speed of response", "B": "Percentage who respond", "C": "Quality of response", "D": "Number of responses"}, "correct_answer": "D"},
    {"id": 35, "difficulty": "medium", "question": "What is non-response bias?", "options": {"A": "Too many responses", "B": "Wrong answers", "C": "When non-respondents differ", "D": "Slow response"}, "correct_answer": "A"},
    {"id": 36, "difficulty": "medium", "question": "What is leading question bias?", "options": {"A": "Complex question", "B": "Suggests the answer", "C": "Simple question", "D": "Open question"}, "correct_answer": "B"},
    {"id": 37, "difficulty": "medium", "question": "What is measurement error?", "options": {"A": "Tool error", "B": "Calculation error", "C": "Graph error", "D": "Presentation error"}, "correct_answer": "C"},
    {"id": 38, "difficulty": "medium", "question": "What is a data collection instrument?", "options": {"A": "Tool for collection", "B": "Analysis tool", "C": "Presentation tool", "D": "Storage tool"}, "correct_answer": "D"},
    {"id": 39, "difficulty": "medium", "question": "What is qualitative data?", "options": {"A": "Numerical data", "B": "Descriptive data", "C": "Both", "D": "Neither"}, "correct_answer": "A"},
    {"id": 40, "difficulty": "medium", "question": "What is quantitative data?", "options": {"A": "Descriptive data", "B": "Continuous data", "C": "Numerical data", "D": "Both"}, "correct_answer": "B"},

    {"id": 41, "difficulty": "hard", "question": "What is snowball sampling?", "options": {"A": "Random sampling", "B": "Participants refer others", "C": "Convenience sampling", "D": "Cluster sampling"}, "correct_answer": "A"},
    {"id": 42, "difficulty": "hard", "question": "What is purposive sampling?", "options": {"A": "Selecting specific cases", "B": "Random selection", "C": "Convenience selection", "D": "Cluster sampling"}, "correct_answer": "B"},
    {"id": 43, "difficulty": "hard", "question": "What is quota sampling?", "options": {"A": "Random sampling", "B": "Systematic sampling", "C": "Meeting quotas", "D": "Cluster sampling"}, "correct_answer": "C"},
    {"id": 44, "difficulty": "hard", "question": "What is multistage sampling?", "options": {"A": "Single stage", "B": "Multiple levels", "C": "Random only", "D": "Convenience"}, "correct_answer": "D"},
    {"id": 45, "difficulty": "hard", "question": "What is probability sampling?", "options": {"A": "Known probability", "B": "Unknown probability", "C": "Equal probability", "D": "No probability"}, "correct_answer": "A"},
    {"id": 46, "difficulty": "hard", "question": "What is non-probability sampling?", "options": {"A": "Known probability", "B": "Unknown probability", "C": "Equal probability", "D": "Convenience"}, "correct_answer": "B"},
    {"id": 47, "difficulty": "hard", "question": "What is sampling frame?", "options": {"A": "List of population", "B": "Sample size", "C": "Sampling method", "D": "Tool"}, "correct_answer": "C"},
    {"id": 48, "difficulty": "hard", "question": "What is sampling error?", "options": {"A": "Difference between sample & population", "B": "Measurement error", "C": "Data mistake", "D": "Tool error"}, "correct_answer": "D"},
    {"id": 49, "difficulty": "hard", "question": "What is non-sampling error?", "options": {"A": "Sampling mistakes", "B": "Not due to sampling", "C": "Both", "D": "Neither"}, "correct_answer": "A"},
    {"id": 50, "difficulty": "hard", "question": "What is margin of error?", "options": {"A": "Range around statistic", "B": "Sampling mistake", "C": "Data error", "D": "Calculation error"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "hard", "question": "What is confidence level?", "options": {"A": "Response rate", "B": "Probability interval contains parameter", "C": "Accuracy level", "D": "Sample size"}, "correct_answer": "C"},
    {"id": 52, "difficulty": "hard", "question": "What is statistical power?", "options": {"A": "Sample size", "B": "Detecting effect probability", "C": "Effect strength", "D": "Confidence level"}, "correct_answer": "D"},
    {"id": 53, "difficulty": "hard", "question": "What is effect size?", "options": {"A": "Sample size", "B": "Magnitude of difference", "C": "Significance", "D": "Data size"}, "correct_answer": "A"},
    {"id": 54, "difficulty": "hard", "question": "What is p-hacking?", "options": {"A": "Manipulating data", "B": "Data cleaning", "C": "Computer hacking", "D": "Stat analysis"}, "correct_answer": "B"},
    {"id": 55, "difficulty": "hard", "question": "What is publication bias?", "options": {"A": "Writing bias", "B": "Only significant results published", "C": "Publisher preference", "D": "Author bias"}, "correct_answer": "C"},
    {"id": 56, "difficulty": "hard", "question": "What is the Hawthorne effect?", "options": {"A": "Placebo effect", "B": "Behavior change from observation", "C": "Lighting effect", "D": "Sampling effect"}, "correct_answer": "D"},
    {"id": 57, "difficulty": "hard", "question": "What is the placebo effect?", "options": {"A": "Actual treatment effect", "B": "Belief-based improvement", "C": "Observation effect", "D": "Sampling effect"}, "correct_answer": "A"},
    {"id": 58, "difficulty": "hard", "question": "What is double-blind study?", "options": {"A": "Both know groups", "B": "Participants blind only", "C": "Researchers blind only", "D": "Neither knows groups"}, "correct_answer": "B"},
    {"id": 59, "difficulty": "hard", "question": "What is single-blind study?", "options": {"A": "Researchers don’t know", "B": "Participants don’t know", "C": "Both know", "D": "Neither knows"}, "correct_answer": "C"},
    {"id": 60, "difficulty": "hard", "question": "What is cross-over design?", "options": {"A": "Different groups", "B": "Participants receive all treatments", "C": "Single treatment", "D": "No treatment"}, "correct_answer": "D"}
  ,
{"id":61,"difficulty":"easy","question":"Which method involves asking people questions directly?","options":{"A":"Observation","B":"Interview","C":"Experiment","D":"Recording"},"correct_answer":"B"},
  {"id":62,"difficulty":"easy","question":"What tool is used to record answers in a survey?","options":{"A":"Graph","B":"Questionnaire","C":"Scale","D":"Table"},"correct_answer":"B"},
  {"id":63,"difficulty":"easy","question":"Counting the number of books in a library is an example of?","options":{"A":"Guessing","B":"Collecting data","C":"Analyzing data","D":"Presenting data"},"correct_answer":"B"},
  {"id":64,"difficulty":"easy","question":"Which of these helps in counting data easily?","options":{"A":"Bar graph","B":"Tally marks","C":"Pie chart","D":"Line graph"},"correct_answer":"B"},
  {"id":65,"difficulty":"easy","question":"Which data is collected by you yourself?","options":{"A":"Secondary data","B":"Primary data","C":"Old data","D":"Published data"},"correct_answer":"B"},
  {"id":66,"difficulty":"easy","question":"What is the main aim of data collection?","options":{"A":"Decoration","B":"Entertainment","C":"Information","D":"Confusion"},"correct_answer":"C"},
  {"id":67,"difficulty":"easy","question":"Which is an example of secondary data?","options":{"A":"Survey in class","B":"School attendance register","C":"Asking neighbors","D":"Interview"},"correct_answer":"B"},
  {"id":68,"difficulty":"easy","question":"Which is easier to understand for large data?","options":{"A":"Paragraph","B":"Table","C":"Story","D":"Essay"},"correct_answer":"B"},
  {"id":69,"difficulty":"easy","question":"Which step comes after collecting data?","options":{"A":"Ignoring","B":"Organizing","C":"Guessing","D":"Deleting"},"correct_answer":"B"},
  {"id":70,"difficulty":"easy","question":"What do tally marks help to find?","options":{"A":"Color","B":"Frequency","C":"Shape","D":"Length"},"correct_answer":"B"},
  {"id":71,"difficulty":"easy","question":"Which of these is NOT a data source?","options":{"A":"Survey","B":"Census","C":"Guess","D":"Observation"},"correct_answer":"C"},
  {"id":72,"difficulty":"easy","question":"Which data tells about qualities like color or taste?","options":{"A":"Numerical","B":"Quantitative","C":"Qualitative","D":"Measured"},"correct_answer":"C"},
  {"id":73,"difficulty":"easy","question":"Data written in rows and columns is called?","options":{"A":"Graph","B":"Table","C":"Chart","D":"Diagram"},"correct_answer":"B"},
  {"id":74,"difficulty":"easy","question":"Which is a correct tally for 10?","options":{"A":"|||| ||||","B":"||||/ ||||/","C":"//// ////","D":"|||| |||"},"correct_answer":"B"},
  {"id":75,"difficulty":"easy","question":"Who collects census data in India?","options":{"A":"School","B":"Government","C":"Students","D":"Teachers"},"correct_answer":"B"},
  {"id":76,"difficulty":"easy","question":"Which is easier for counting votes?","options":{"A":"Story","B":"Tally marks","C":"Paragraph","D":"Essay"},"correct_answer":"B"},
  {"id":77,"difficulty":"easy","question":"What should data always be?","options":{"A":"Biased","B":"Incorrect","C":"Accurate","D":"Hidden"},"correct_answer":"C"},
  {"id":78,"difficulty":"easy","question":"What do we call the total number of times a value occurs?","options":{"A":"Population","B":"Frequency","C":"Sample","D":"Range"},"correct_answer":"B"},
  {"id":79,"difficulty":"easy","question":"Which data comes from books or internet?","options":{"A":"Primary","B":"Secondary","C":"Sample","D":"Raw"},"correct_answer":"B"},
  {"id":80,"difficulty":"easy","question":"Which is used before drawing a graph?","options":{"A":"Frequency table","B":"Picture","C":"Story","D":"Guess"},"correct_answer":"A"},

  {"id":81,"difficulty":"medium","question":"Why is sampling used instead of census?","options":{"A":"Less accurate","B":"Saves time and cost","C":"More confusing","D":"Less reliable"},"correct_answer":"B"},
  {"id":82,"difficulty":"medium","question":"Which sampling gives every member equal chance?","options":{"A":"Convenience","B":"Random","C":"Quota","D":"Judgement"},"correct_answer":"B"},
  {"id":83,"difficulty":"medium","question":"Which data is numerical in nature?","options":{"A":"Qualitative","B":"Quantitative","C":"Descriptive","D":"Categorical"},"correct_answer":"B"},
  {"id":84,"difficulty":"medium","question":"Collecting data from newspapers is called?","options":{"A":"Primary","B":"Secondary","C":"Sampling","D":"Survey"},"correct_answer":"B"},
  {"id":85,"difficulty":"medium","question":"Which method may introduce personal bias?","options":{"A":"Random sampling","B":"Observation","C":"Interview","D":"Census"},"correct_answer":"C"},
  {"id":86,"difficulty":"medium","question":"What happens if survey questions are unclear?","options":{"A":"Accurate data","B":"Biased data","C":"Reliable results","D":"Perfect analysis"},"correct_answer":"B"},
  {"id":87,"difficulty":"medium","question":"What does a frequency table summarize?","options":{"A":"Values only","B":"Occurrences","C":"Pictures","D":"Stories"},"correct_answer":"B"},
  {"id":88,"difficulty":"medium","question":"Which is NOT qualitative data?","options":{"A":"Color","B":"Taste","C":"Height","D":"Type"},"correct_answer":"C"},
  {"id":89,"difficulty":"medium","question":"Which step ensures data correctness?","options":{"A":"Cleaning","B":"Guessing","C":"Deleting","D":"Ignoring"},"correct_answer":"A"},
  {"id":90,"difficulty":"medium","question":"A small group representing population is called?","options":{"A":"Census","B":"Sample","C":"Survey","D":"Frame"},"correct_answer":"B"},

  {"id":91,"difficulty":"medium","question":"Which data collection method is best for large populations?","options":{"A":"Interview","B":"Census","C":"Sampling","D":"Observation"},"correct_answer":"C"},
  {"id":92,"difficulty":"medium","question":"Why are tally marks grouped in fives?","options":{"A":"Decoration","B":"Easy counting","C":"Looks neat","D":"Random rule"},"correct_answer":"B"},
  {"id":93,"difficulty":"medium","question":"Which data type represents categories like fruits or colors?","options":{"A":"Numerical","B":"Quantitative","C":"Qualitative","D":"Measured"},"correct_answer":"C"},
  {"id":94,"difficulty":"medium","question":"Which situation requires primary data?","options":{"A":"Population report","B":"School textbook","C":"Class favourite sport survey","D":"Internet article"},"correct_answer":"C"},
  {"id":95,"difficulty":"medium","question":"Which method may give biased data if questions are unclear?","options":{"A":"Random sampling","B":"Survey","C":"Census","D":"Observation"},"correct_answer":"B"},
  {"id":96,"difficulty":"medium","question":"What does organizing data help with?","options":{"A":"Confusion","B":"Easy analysis","C":"Guessing","D":"Hiding information"},"correct_answer":"B"},
  {"id":97,"difficulty":"medium","question":"Which of these is NOT a method of data collection?","options":{"A":"Survey","B":"Observation","C":"Interview","D":"Calculation"},"correct_answer":"D"},
  {"id":98,"difficulty":"medium","question":"Why is secondary data useful?","options":{"A":"Always accurate","B":"Saves time","C":"Never biased","D":"Easy to change"},"correct_answer":"B"},
  {"id":99,"difficulty":"medium","question":"What is the role of a questionnaire?","options":{"A":"Analyze data","B":"Present data","C":"Collect data","D":"Store data"},"correct_answer":"C"},
  {"id":100,"difficulty":"medium","question":"Which data is measured using numbers?","options":{"A":"Qualitative","B":"Categorical","C":"Quantitative","D":"Descriptive"},"correct_answer":"C"},

  {"id":101,"difficulty":"medium","question":"Which of these improves accuracy in data collection?","options":{"A":"Guessing","B":"Clear questions","C":"Leading words","D":"Small sample"},"correct_answer":"B"},
  {"id":102,"difficulty":"medium","question":"What is a disadvantage of census method?","options":{"A":"Less accurate","B":"Time consuming","C":"Biased","D":"Incomplete"},"correct_answer":"B"},
  {"id":103,"difficulty":"medium","question":"Which data collection method is cheapest?","options":{"A":"Census","B":"Interview","C":"Sampling","D":"Observation"},"correct_answer":"C"},
  {"id":104,"difficulty":"medium","question":"Which situation best suits observation method?","options":{"A":"Favorite color","B":"Behavior in playground","C":"Exam scores","D":"Age of students"},"correct_answer":"B"},
  {"id":105,"difficulty":"medium","question":"Why should survey questions be neutral?","options":{"A":"To confuse","B":"To avoid bias","C":"To reduce time","D":"To increase length"},"correct_answer":"B"},
  {"id":106,"difficulty":"medium","question":"Which data is best represented using tally marks?","options":{"A":"Very large values","B":"Small whole numbers","C":"Decimals","D":"Fractions"},"correct_answer":"B"},
  {"id":107,"difficulty":"medium","question":"Which of these is an example of qualitative data?","options":{"A":"Height","B":"Weight","C":"Number of books","D":"Type of fruit"},"correct_answer":"D"},
  {"id":108,"difficulty":"medium","question":"Why is data cleaning important?","options":{"A":"To decorate","B":"To remove errors","C":"To change answers","D":"To add data"},"correct_answer":"B"},
  {"id":109,"difficulty":"medium","question":"Which step comes immediately after recording data?","options":{"A":"Analysis","B":"Organization","C":"Prediction","D":"Deletion"},"correct_answer":"B"},
  {"id":110,"difficulty":"medium","question":"Which sampling method selects every 5th person?","options":{"A":"Random","B":"Systematic","C":"Cluster","D":"Convenience"},"correct_answer":"B"},

  {"id":111,"difficulty":"medium","question":"What is the purpose of a frequency table?","options":{"A":"Show totals","B":"Show repetition","C":"Show pictures","D":"Show stories"},"correct_answer":"B"},
  {"id":112,"difficulty":"medium","question":"Which factor affects reliability of data?","options":{"A":"Font size","B":"Sample size","C":"Paper color","D":"Pen type"},"correct_answer":"B"},
  {"id":113,"difficulty":"medium","question":"Which data collection method uses written questions?","options":{"A":"Observation","B":"Interview","C":"Questionnaire","D":"Experiment"},"correct_answer":"C"},
  {"id":114,"difficulty":"medium","question":"Why is sampling preferred over census?","options":{"A":"More accurate","B":"Less effort","C":"Saves time and money","D":"No planning needed"},"correct_answer":"C"},
  {"id":115,"difficulty":"medium","question":"Which of these is secondary data?","options":{"A":"Class survey","B":"Interview notes","C":"Government report","D":"Observation"},"correct_answer":"C"},
  {"id":116,"difficulty":"medium","question":"What does biased data lead to?","options":{"A":"Correct result","B":"Misleading result","C":"Perfect graph","D":"Clear trend"},"correct_answer":"B"},
  {"id":117,"difficulty":"medium","question":"Which data collection method gives detailed answers?","options":{"A":"MCQ survey","B":"Interview","C":"Tally marks","D":"Counting"},"correct_answer":"B"},
  {"id":118,"difficulty":"medium","question":"Which is NOT an advantage of sampling?","options":{"A":"Less time","B":"Lower cost","C":"100% accuracy","D":"Easy handling"},"correct_answer":"C"},
  {"id":119,"difficulty":"medium","question":"Which data best represents opinions?","options":{"A":"Quantitative","B":"Numerical","C":"Qualitative","D":"Measured"},"correct_answer":"C"},
  {"id":120,"difficulty":"medium","question":"Why should sample represent population?","options":{"A":"For decoration","B":"For accurate results","C":"For speed","D":"For simplicity"},"correct_answer":"B"},

  {"id":121,"difficulty":"medium","question":"Which method may be affected by interviewer’s tone?","options":{"A":"Observation","B":"Interview","C":"Sampling","D":"Census"},"correct_answer":"B"},
  {"id":122,"difficulty":"medium","question":"What is a disadvantage of interview method?","options":{"A":"Too detailed","B":"Time consuming","C":"Inaccurate","D":"Cheap"},"correct_answer":"B"},
  {"id":123,"difficulty":"medium","question":"Which of these reduces data bias?","options":{"A":"Leading questions","B":"Neutral questions","C":"Guessing","D":"Convenience sampling"},"correct_answer":"B"},
  {"id":124,"difficulty":"medium","question":"Which data is easiest to analyze?","options":{"A":"Unorganized","B":"Organized","C":"Random","D":"Unrecorded"},"correct_answer":"B"},
  {"id":125,"difficulty":"medium","question":"Which data collection method observes without asking?","options":{"A":"Survey","B":"Interview","C":"Observation","D":"Sampling"},"correct_answer":"C"},
  {"id":126,"difficulty":"medium","question":"Why is accurate data important?","options":{"A":"For decoration","B":"For correct decisions","C":"For speed","D":"For guessing"},"correct_answer":"B"},
  {"id":127,"difficulty":"medium","question":"Which method is suitable for opinions?","options":{"A":"Measurement","B":"Survey","C":"Counting","D":"Experiment"},"correct_answer":"B"},
  {"id":128,"difficulty":"medium","question":"Which of these is NOT quantitative data?","options":{"A":"Marks","B":"Age","C":"Weight","D":"Favorite color"},"correct_answer":"D"},
  {"id":129,"difficulty":"medium","question":"What does a well-designed questionnaire ensure?","options":{"A":"Bias","B":"Accuracy","C":"Confusion","D":"Delay"},"correct_answer":"B"},
  {"id":130,"difficulty":"medium","question":"Which factor is most important in data collection?","options":{"A":"Accuracy","B":"Speed","C":"Color","D":"Length"},"correct_answer":"A"}

 ,
  {"id":131,"difficulty":"hard","question":"Which sampling method depends on researcher judgement?","options":{"A":"Random","B":"Systematic","C":"Purposive","D":"Cluster"},"correct_answer":"C"},
  {"id":132,"difficulty":"hard","question":"Which error occurs due to poor measuring tools?","options":{"A":"Sampling error","B":"Measurement error","C":"Response error","D":"Frame error"},"correct_answer":"B"},
  {"id":133,"difficulty":"hard","question":"What increases reliability of collected data?","options":{"A":"Bias","B":"Small sample","C":"Clear questions","D":"Guessing"},"correct_answer":"C"},
  {"id":134,"difficulty":"hard","question":"Which bias occurs when people don’t respond?","options":{"A":"Response bias","B":"Sampling bias","C":"Non-response bias","D":"Measurement bias"},"correct_answer":"C"},
  {"id":135,"difficulty":"hard","question":"Which sampling uses fixed interval selection?","options":{"A":"Random","B":"Systematic","C":"Cluster","D":"Quota"},"correct_answer":"B"},
  {"id":136,"difficulty":"hard","question":"What improves accuracy in surveys?","options":{"A":"Leading questions","B":"Large sample","C":"Convenience sampling","D":"Guessing"},"correct_answer":"B"},
  {"id":137,"difficulty":"hard","question":"Which is NOT a probability sampling method?","options":{"A":"Random","B":"Systematic","C":"Convenience","D":"Stratified"},"correct_answer":"C"},
  {"id":138,"difficulty":"hard","question":"Sampling frame should include?","options":{"A":"Only sample","B":"Whole population list","C":"Random names","D":"Few entries"},"correct_answer":"B"},
  {"id":139,"difficulty":"hard","question":"Which improves survey neutrality?","options":{"A":"Leading words","B":"Neutral language","C":"Opinionated tone","D":"Personal bias"},"correct_answer":"B"},
  {"id":140,"difficulty":"hard","question":"What reduces sampling error?","options":{"A":"Small sample","B":"Large sample","C":"Guessing","D":"Bias"},"correct_answer":"B"},
  {"id":141,"difficulty":"hard","question":"Which data type uses numbers only?","options":{"A":"Qualitative","B":"Quantitative","C":"Categorical","D":"Descriptive"},"correct_answer":"B"},
  {"id":142,"difficulty":"hard","question":"What is the main disadvantage of convenience sampling?","options":{"A":"Time consuming","B":"Bias","C":"Costly","D":"Complex"},"correct_answer":"B"},
  {"id":143,"difficulty":"hard","question":"Which survey type allows free answers?","options":{"A":"Closed-ended","B":"MCQ","C":"Open-ended","D":"Rating"},"correct_answer":"C"},
  {"id":144,"difficulty":"hard","question":"Which data best suits pie charts?","options":{"A":"Qualitative proportions","B":"Raw text","C":"Stories","D":"Descriptions"},"correct_answer":"A"},
  {"id":145,"difficulty":"hard","question":"What happens if sample is not representative?","options":{"A":"Accurate result","B":"Biased result","C":"Perfect analysis","D":"Clear trend"},"correct_answer":"B"},
  {"id":146,"difficulty":"hard","question":"Which reduces interviewer bias?","options":{"A":"Leading tone","B":"Standard questions","C":"Personal opinion","D":"Guessing"},"correct_answer":"B"},
  {"id":147,"difficulty":"hard","question":"Which data collection method is fastest?","options":{"A":"Census","B":"Sampling","C":"Observation","D":"Interview"},"correct_answer":"B"},
  {"id":148,"difficulty":"hard","question":"Which improves data validity?","options":{"A":"Random errors","B":"Clear definitions","C":"Bias","D":"Guessing"},"correct_answer":"B"},
  {"id":149,"difficulty":"hard","question":"What is the risk of small sample size?","options":{"A":"Accuracy","B":"Bias","C":"Precision","D":"Validity"},"correct_answer":"B"},
  {"id":150,"difficulty":"hard","question":"Which step comes just before data analysis?","options":{"A":"Collection","B":"Cleaning","C":"Presentation","D":"Prediction"},"correct_answer":"B"}
]
}