An occupational psychologist collated the self-report logs of all participants over a three-week period and calculated the mean and standard deviation for each condition.
Table 3: Mean number of headaches and standard deviations for two lighting conditions
| Mean number of headaches in 21 days | Standard deviation | |
|---|---|---|
| Fluorescent lighting | 3.65 | 2.24 |
| Daylight-replicating LED | 1.10 | 0.72 |
What do the mean and standard deviation values in Table 3 suggest about the effect of the lighting condition on the occurrence of headaches? Justify your answer.
235 exam-style questions on AQA A Level Psychology Data handling and analysis. Each one has a worked solution and a mark scheme showing where the marks go.