Lesson 4.2.3.2.3

4.2.3.2.3 Presentation of data, percentages and distributions Quiz: AQA Psychology, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.2.3.2.3, Presentation of data, percentages and distributions: 20 multiple choice questions for the AQA Psychology (7182), Unit 2: Psychology in context, written with Revision Ninja.

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The 20 questions

  1. A bar chart is most appropriate for displaying:

    • Frequencies of discrete or categorical data, with separated bars
    • Proportions within a whole when showing one total divided into its parts
    • Continuous data grouped into touching bars that show the scale of the measurement
    • Relationships between two continuous variables plotted as points on the two axes

  2. A histogram is used for:

    • Showing the relationship between two co-variables plotted as points on a graph
    • Continuous data, with bars that touch to show that the scale is continuous
    • Nominal categories with gaps between bars, so that each category stands alone
    • Showing a single average value for each group in the study, with error bars

  3. A scattergram is used to:

    • Display the percentage of each category in a whole, with the parts shown as slices
    • Show the frequency of categories as separated bars, one bar for each category
    • Show the relationship between two co-variables, one plotted on each axis
    • Show how a single variable is distributed over time, with the time on one axis

  4. A normal distribution is:

    • A distribution with a long tail on the right, where high scores are rare and spread out
    • A symmetrical, bell-shaped distribution in which the mean, median and mode are equal
    • A distribution where every value occurs exactly once, so each score is unique in the set
    • A distribution with an extreme outlier at one end, which pulls the whole curve to one side

  5. A positively skewed distribution has:

    • A tail towards higher values, with the mean typically greater than the median
    • A tail towards lower values, with the mean typically less than the median, as high scores cluster
    • A perfectly symmetrical shape with no tails, so the mean, median and mode are equal
    • All values equal to the mode, so the data have no spread and every score is identical

  6. A negatively skewed distribution has:

    • A bimodal shape with two equal peaks
    • A tail towards lower values, with the mean typically less than the median
    • No difference between the mean and the mode
    • A tail towards higher values, with the mean typically greater than the median

  7. Test scores cluster at the high end, with only a few very low scores. What type of distribution is this?

    • Negatively skewed
    • Positively skewed
    • Normal
    • Uniform with no peak

  8. Heights in a large, random sample of adults are expected to show which distribution?

    • Perfectly uniform
    • Approximately normal
    • Strongly negatively skewed
    • Strongly positively skewed

  9. A researcher wants to show the proportion of each category within a whole, using one total. Which graph is most suitable?

    • A pie chart
    • A histogram
    • A line graph of individual scores
    • A scattergram

  10. A researcher wants to compare the frequency of four categories of response. Which graph is most suitable?

    • A scattergram
    • A bar chart
    • A normal curve with no axes
    • A histogram of continuous data

  11. A group of 18 out of 60 participants chose option A. What percentage is this?

    • 18%
    • 60%
    • 33%
    • 30%

  12. A group's score rises from 40 to 52. What is the percentage increase?

    • 40%
    • 52%
    • 12%
    • 30%

  13. In a sample of 200 people, 25 reported a particular behaviour. What percentage is this?

    • 25%
    • 12.5%
    • 12.25%
    • 8.5%

  14. Test scores clustered around a central value with one very high score. The mean is 30 and the median is 25. What does this show?

    • A uniform distribution with no central tendency
    • A normal distribution, since the mean and median differ
    • A negatively skewed distribution, since the mean is greater than the median
    • A positively skewed distribution, since the mean is greater than the median

  15. A score falls from 80 to 60. What is the percentage change?

    • A decrease of 33%
    • A decrease of 25%
    • An increase of 25%
    • A decrease of 20%

  16. In a study of 350 participants, 60% answered yes. How many answered yes?

    • 185
    • 210
    • 240
    • 140

  17. Why is a histogram preferred to a bar chart when displaying reaction times?

    • Reaction times are continuous, so touching bars show the continuous scale and the shape of the distribution
    • Bar charts cannot display any numerical data at all, so reaction times must always be drawn as a histogram instead
    • Reaction times are categorical, so gaps between bars are needed to show the separate groups clearly
    • Histograms show only the mode of the distribution, so the full spread of the reaction times cannot be seen at all

  18. Evaluate a histogram that has a vertical axis starting at a value well above zero. What is the main concern?

    • The differences between bars may look exaggerated, which misrepresents the data
    • The histogram no longer shows frequencies, so the bars show percentages of the whole
    • The histogram cannot display continuous data, so the scale must be changed to categories
    • The histogram is now a scattergram, since the axis shows two variables at the same time

  19. In a sample of 80 people, 20 chose option B. What percentage chose option B?

    • 80%
    • 25%
    • 20%
    • 40%

  20. A histogram shows a long tail on the left, with most scores at the high end. What is the expected relationship between the mean and the median?

    • The mean is less than the median
    • The mean is always equal to the mode
    • The mean is greater than the median
    • The mean is exactly equal to the median

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