Mr Robinson has asked geography students and mathematics students to take part in an experiment - AQA - A-Level Psychology - Question 5 - 2018 - Paper 1

For the geography students, perform a similar calculation:

Calculating the sum:

$9 + 10 + 5 + 8 + 8 + 5 + 8 + 11 + 13 = 77$

Next, divide by the number of participants (9):

$ext{Mean} = \frac{77}{9} \approx 8.5$

Thus, the mean number of words correctly retrieved by the geography students is 8.5.

Mr Robinson would likely use the Mann Whitney test to analyze the data. This test is appropriate as it compares two independent groups (mathematics and geography students) to determine if there are statistically significant differences in the median scores, given that the mathematics students experienced an interference task.

One strength of using quantitative data is that Mr Robinson does not need to personally interpret the numerical data regarding the number of words retrieved. This means that his analysis can be more objective, minimizing any biases that might occur if the results were based on qualitative data.