Lesson 9.1.4

9.1.4 Descriptive statistics Quiz: Pearson Edexcel Psychology, Unit 9

20 questions

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Lesson 9.1.4, Descriptive statistics: 20 multiple choice questions for the Pearson Edexcel Psychology (9PS0), Unit 9: Psychological skills, written with Revision Ninja.

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The 20 questions

  1. Which measure of central tendency is the most frequently occurring value in a data set?

    • Mean
    • Mode
    • Range
    • Median

  2. A set of scores is 3, 5, 5, 7, 40. Which measure of central tendency is least affected by the extreme value 40?

    • Median
    • Mean
    • Total
    • Range

  3. Using the scores 3, 5, 5, 7, 40, what is the mean?

    • 40
    • 12
    • 7
    • 5

  4. A frequency table shows that 12 people chose option A, 8 chose B and 4 chose C. How many people responded in total?

    • 12
    • 4
    • 24
    • 8

  5. Which graph is best for displaying frequencies of categorical data, such as favourite drinks?

    • Line graph
    • Scatter diagram
    • Bar chart
    • Histogram

  6. Which graph is best for showing the relationship between two continuous variables?

    • Histogram
    • Bar chart
    • Scatter diagram
    • Pie chart

  7. In a normal distribution curve, what is the relationship between the mean, median, and mode?

    • Median is highest
    • Mean is higher
    • They are equal
    • Mode is highest

  8. What type of distribution occurs when data has a long tail extending towards higher values?

    • Normally distributed
    • Bimodal distribution
    • Positively skewed
    • Negatively skewed

  9. In a positively skewed distribution, how does the mean compare to the median?

    • They are equal
    • Mean is lower
    • Median is zero
    • Mean is higher

  10. What property of a dataset does standard deviation measure?

    • Dispersion
    • Skewness
    • Statistical power
    • Central tendency

  11. Group A has a lower standard deviation than Group B. What does this indicate about Group A?

    • Less dispersion
    • Negative skewness
    • Higher mean score
    • Greater variance

  12. Which visual feature distinguishes a histogram from a bar chart?

    • Bars have gaps
    • Bars touch
    • Diagonal plot line
    • Circular slice shape

  13. What is the primary purpose of sense checking raw data in psychological research?

    • Finding statistical significance
    • Spotting implausible values
    • Drawing bar charts
    • Calculating standard deviation

  14. On a scatter diagram, what does a line of points sloping upwards from left to right show?

    • Strong positive correlation
    • No correlation
    • Cause and effect
    • Strong negative correlation

  15. Scores for group A have a mean of 14 and group B has a mean of 9. What is the difference between the means?

    • 14
    • 9
    • 5
    • 23

  16. When comparing group means in psychology, what additional descriptive statistic must be evaluated?

    • Sample size alone
    • Level of significance
    • Spread of data
    • Critical value

  17. What is the best way to present raw counts across distinct age categories in a summary table?

    • Pie chart
    • Scatter graph
    • Frequency table
    • Correlation matrix

  18. The range of a set of test scores is 25. The lowest score is 18. What is the highest score?

    • 18
    • 25
    • 7
    • 43

  19. Which measure of central tendency is best for a dataset containing extreme outliers?

    • Mode
    • Median
    • Mean
    • Variance

  20. Why is reporting only the mean an incomplete summary of a dataset?

    • Hides experimental design
    • Ignores sample names
    • Measures dispersion only
    • Ignores data spread

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