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Ken is planning to research whether the time of day has an impact on working memory processing speed - AQA - A-Level Psychology - Question 5 - 2021 - Paper 1
Question 5
Ken is planning to research whether the time of day has an impact on working memory processing speed. He intends to use high school students from the city where he l... show full transcript
Worked Solution & Example Answer:Ken is planning to research whether the time of day has an impact on working memory processing speed - AQA - A-Level Psychology - Question 5 - 2021 - Paper 1
Step 1
Describe how Ken would gather a stratified sample for his research.
Answer
To gather a stratified sample, Ken would first identify different strata within the high school population demographic in the city he has chosen. This may include factors such as age, gender, or school type. After determining the relevant strata, he would select participants from each stratum in proportion to their representation in the overall population. For example, if there are more male students in a specific age group, he would ensure that males are selected in proportions that reflect this demographic, thus ensuring a representative sample for his research.
Step 2
Explain which statistical test Ken would use for his data.
Answer
Ken would use a Wilcoxon signed-ranks test because he is comparing two related samples: the time taken by participants to complete tasks in the morning versus the afternoon. This non-parametric test is appropriate when the data does not necessarily follow a normal distribution, and it will help determine if there is a statistically significant difference in working memory processing speed between the two times of day.