plumiInferential statistics: OCR A‑Level Psychology questions
Every OCR A-Level Psychology exam question on Inferential statistics, 2021–2025, with its mark scheme and examiner’s report.
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Q28(a)
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Q29(a)
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Q26(a)
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All 43 questions on Inferential statistics, as a list
- June 2025, Paper 1, Q3 (1 mark): A study investigated if there was a difference in memory for a list of 30 words. The same participants were assessed at 9am and again at 9pm. Memory was measure
- June 2025, Paper 1, Q7 (1 mark): What does N refer to in this table of critical values for the Mann-Whitney U test? N2 5 6 7 8 9 10 11 12 13 14 15 N1 5 2 3 5 6 7 8 9 11 12 13 14 6 3 5 6 8 10 11
- June 2025, Paper 1, Q28(a) (2 marks): Outline one reason why the Chi-square test would be the appropriate inferential statistical test to analyse the data in Table 2.
- June 2025, Paper 1, Q28(b) (5 marks): Table 3 shows the data from Table 2 with expected frequencies (E values) provided in bold and in brackets. Table 3 Number of ‘yes’ and ‘no’ responses when asked
- June 2025, Paper 1, Q28(c) (3 marks): Explain what p<0.05 would mean as part of the significance statement for the analysis of this data.
- June 2024, Paper 1, Q3 (1 mark): Which of these indicates there is less than a 2.5% chance of the null hypothesis being true? A p < 2.50 B p < 0.25 C p < 0.025 D p > 0.0025
- June 2024, Paper 1, Q7 (1 mark): Which of these is true of the calculated value (observed value) in a statistical test of significance? A it is always a whole number B it is based on the data c
- June 2024, Paper 1, Q27 (2 marks): Give one reason why the Mann-Whitney U test is the appropriate inferential test to use to analyse the data from this study.
- June 2024, Paper 1, Q28 (3 marks): Before using the formula for the Mann-Whitney U test, the data obtained must be ranked. In the results, two participants have the same score of 24. Explain how
- June 2024, Paper 1, Q29(a) (5 marks): Calculate the U value for the Mann-Whitney U test for the data collected in this study. Show your workings. You may use the formula presented below. U = the sma
- June 2024, Paper 1, Q29(b) (1 mark): How is the critical value used to determine if the findings are statistically significant?
- June 2024, Paper 1, Q30 (3 marks): Explain what p > 0.05 would mean if it appeared as part of the significance statement when reporting the findings from this study.
- June 2023, Paper 1, Q4 (1 mark): Which inferential statistical test at some stage involves a calculation based on the number of rows of data and the number of columns of data? A Chi-square B Ma
- June 2023, Paper 1, Q5 (1 mark): Which of these would be the appropriate inferential test to use to analyse the data in a study investigating the difference in reaction times to two types of st
- June 2023, Paper 1, Q7 (1 mark): If the null hypothesis is incorrectly rejected, what type of error is said to have been made? A a type 1 error B a type 2 error C both a type 1 and a type 2 err
- June 2023, Paper 1, Q13 (1 mark): If this data (48, 24, 39, 50, 32, 39) was ranked, what rank would be assigned to 39? A 2.5 B 3.5 C 4 D 4.5
- June 2023, Paper 1, Q14 (1 mark): In which of these distribution curves is the mean, median and mode all the same value? A bimodal B negatively skewed C normal D positively skewed
- June 2023, Paper 1, Q15 (1 mark): For which of these inferential statistical tests can the sample size in each condition be different? A Binomial Sign test B Mann-Whitney U test C Wilcoxon Signe
- June 2023, Paper 1, Q26(a) (2 marks): Explain what ranking the data means.
- June 2023, Paper 1, Q26(b) (2 marks): Explain why there are three ranks of 17.
- June 2023, Paper 1, Q30(a) (5 marks): Calculate the U value for the data collected in this study using the Mann-Whitney U test formula provided. Show your workings. U = the smaller of U1 and U2 Wher
- June 2023, Paper 1, Q30(b) (2 marks): The table below shows critical values at the 5% level of probability for the Mann-Whitney U test. Using the table, state the critical value and explain how you
- June 2023, Paper 1, Q30(c) (2 marks): Write the significance statement for the analysis performed on this data.
- June 2022, Paper 1, Q2 (1 mark): Which of these indicates the least probability of the null hypothesis being true? A p<0.05 B p<0.01 C p<0.001 D p>0.01
- June 2022, Paper 1, Q3 (1 mark): Which of these is an inferential rather than a descriptive statistical analysis? A Mann-Whitney U B mean C standard deviation D variance
- June 2022, Paper 1, Q8 (1 mark): What type of data is used to calculate the Chi-square test? A interval B nominal C ordinal D ordinal and interval
- June 2022, Paper 1, Q14 (1 mark): Which inferential statistical test simply involves counting the number of times the values in one condition are higher or lower than those in the other? A Chi-s
- June 2022, Paper 1, Q15 (1 mark): Which of these is not a criterion for the use of parametric inferential statistical tests? A data must be interval level B data must be normally distributed in
- June 2022, Paper 1, Q18 (1 mark): Which of these is a statistical term relating to whether the null hypothesis has been incorrectly accepted or rejected? A critical value B null C one-tailed D t
- June 2022, Paper 1, Q20 (1 mark): In which type of distribution is the mean greater than both the median and the mode? A bimodal B negatively skewed C normal D positively skewed for the next que
- June 2022, Paper 1, Q29 (2 marks): The psychologist used the Chi-square test to analyse the data from this study. Give one reason why this would be the appropriate non-parametric inferential test
- June 2022, Paper 1, Q30(a) (3 marks): Calculate the expected frequency for cell D. Present to two decimal places and show your workings.
- June 2022, Paper 1, Q30(b) (3 marks): Calculate the overall value of Chi-square. Show your workings.
- June 2022, Paper 1, Q30(c) (2 marks): Calculate the degrees of freedom for use with the Chi-square test in this study. Show your workings.
- June 2022, Paper 1, Q30(d) (1 mark): Using the extract from the table of critical values presented below, what is the critical value for use with the Chi-square test in this study at the 1% level o
- June 2022, Paper 1, Q30(e) (3 marks): What conclusions can be reached from the calculation of Chi-square in this study?
- November 2021, Paper 1, Q6 (1 mark): What level of data and type of design are required to use the Mann-Whitney U test? A nominal data with independent measures design B nominal data with repeated
- November 2021, Paper 1, Q9 (1 mark): Which of these is a type of inferential statistical test? A parabolic B paradoxical C parametric D parasympathetic
- November 2021, Paper 1, Q13 (1 mark): In order to use the chi-square test, the expected values (E) of each category of data collected must be worked out first. What is the E value of the data in cat
- November 2021, Paper 1, Q28 (5 marks): Using the Wilcoxon T Signed Ranks test, calculate the value of T. Formula / process for calculating T: T = the sum of differences of the ranks with the least fr
- November 2021, Paper 1, Q29(a) (2 marks): Using the extract of the table of critical values for the Wilcoxon T Signed Ranks test presented below, what is the critical value for a two-tailed test at the
- November 2021, Paper 1, Q29(b) (2 marks): Write the significance statement for the analysis carried out in Question 28 with a probability of 5%, assuming a non-directional hypothesis.
- November 2021, Paper 1, Q29(c) (2 marks): The Wilcoxon T Signed Ranks test was used as the data was considered not to be parametric. Identify two of the criteria for using a parametric test to analyse d
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