Lesson 3.1.4.9.5

3.1.4.9.5 Frequency tables, bar charts, histograms and scatter diagrams Quiz: AQA Psychology, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.1.4.9.5, Frequency tables, bar charts, histograms and scatter diagrams: 20 multiple choice questions for the AQA GCSE Psychology (8182), Unit 4: Research methods, written with Revision Ninja.

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The 20 questions

  1. Which chart is most suitable for displaying discrete categories such as favourite colours?

    • Scatter diagram with a line
    • Frequency polygon of continuous data
    • Bar chart
    • Histogram with no gaps

  2. What is a key feature of a histogram?

    • Bars touch each other
    • Bars have gaps because the categories are separate
    • Each dot represents one participant
    • Bars show only the mode of the data

  3. A researcher groups participants' ages into bands. Which chart fits best?

    • Bar chart with separate categories
    • Histogram
    • Scatter diagram
    • Line of best fit

  4. What does a frequency table show?

    • How often each score or category occurs in the data
    • The exact order in which participants were tested
    • The probability of each outcome in an experiment
    • The mean of each group compared

  5. Why should all bars on a bar chart have equal widths?

    • So that the mean can be found from the bar widths and the number of categories
    • So that the chart can be read as a continuous curve showing the trend over time
    • So that each category has equal visual weight and the heights can be compared fairly
    • So that the chart can display a correlation coefficient between the two variables

  6. Why are bar charts used for categorical data?

    • Categories are continuous, so bars must touch to show a flow
    • Categories must always be ordered by size on the axis
    • Categories are separate, so gaps between bars show they are distinct groups
    • Categories are always ranked by mean score

  7. Which axis of a histogram usually shows frequency?

    • Both axes equally
    • The vertical axis
    • The horizontal axis
    • Neither axis, as it uses a key

  8. What is a key difference between a bar chart and a histogram?

    • Bar charts have gaps between bars, while histograms have bars touching
    • Histograms have gaps between bars, while bar charts have bars touching
    • Bar charts show continuous data only
    • Histograms never show frequencies

  9. A scatter diagram shows points rising from bottom left to top right. What relationship is shown?

    • A proven causal relationship
    • No correlation
    • A negative correlation
    • A positive correlation

  10. A bar chart shows 12 children chose red, 8 chose blue and 5 chose green. Which category is most popular?

    • All are equal
    • Red
    • Green
    • Blue

  11. A frequency table gives score 5 with frequency 4, score 7 with frequency 2 and score 9 with frequency 6. What is the total number of scores?

    • 12
    • 15
    • 9
    • 11

  12. A histogram of reaction times has its tallest bar at 300 to 349 ms. What does this mean?

    • Most participants recorded reaction times in the 300 to 349 ms range
    • All reaction times were identical within that range of 300 to 349 ms
    • The average reaction time was exactly 300 ms across all the participants tested
    • Only one participant had a reaction time in that range, so the bar was the tallest

  13. A researcher plots study hours against test scores and sees a cluster of points in the top right. What does this suggest?

    • Many participants who studied more hours also scored higher
    • Study hours had no effect on the test scores
    • Participants who studied more hours always scored lower
    • Test scores caused more study hours in all cases

  14. Which label belongs on the horizontal axis of a bar chart showing eye colours?

    • Frequency of each eye colour
    • Time in seconds
    • Eye colour categories
    • Mean eye colour score

  15. Why might a researcher choose a histogram over a bar chart for reaction times?

    • Reaction times are continuous
    • Histograms are always easier to draw than bar charts
    • Reaction times are categorical, so a histogram shows separate categories with gaps
    • Histograms show only the mode, which suits reaction times

  16. A scatter diagram has one point far away from the rest. What should the researcher consider?

    • That the point proves the correlation is perfect and the link is certain
    • Whether the point is an outlier that could distort how the pattern looks
    • That the point must be the mean of the data set, so it should be included
    • That the point makes the whole diagram invalid and the study should be abandoned

  17. A frequency table shows 3 participants scored 10, 5 scored 11 and 2 scored 12. How many participants in total?

    • 5
    • 12
    • 3
    • 10

  18. Which feature of a frequency table makes it useful for later calculations of the mean?

    • It shows the correlation between two variables and the strength of their link
    • It lists participants by name and by condition, so each score can be traced
    • Each score is listed with how many times it occurred, allowing totals to be calculated
    • It displays the data as a line of best fit drawn through every single point

  19. Which graph is used to show individual participants' pairs of scores on two variables?

    • Frequency table
    • Scatter diagram
    • Histogram
    • Bar chart

  20. What is the purpose of labelling both axes clearly on a histogram?

    • So the data can be converted into percentages automatically
    • So the mean can be read directly from the bars
    • So the histogram can be used as a bar chart
    • So readers can tell what is measured and how the frequency is counted

All AQA Psychology quizzes