A cognitive psychologist conducted a study to investigate if a new spaced-repetition training app affects memory recall scores. The researcher used a non-directional hypothesis with a related design. Initially, 11 participants took part in the study. After discarding the data of one participant who showed no change in their recall score, the final statistical analysis was conducted using the Wilcoxon T Signed Ranks test.
Using the extract of the table of critical values for the Wilcoxon T Signed Ranks test presented below, what is the critical value for this test at the 5% (0.05) level of significance?
Extract of table of critical values for Wilcoxon T Signed Ranks test (T is significant if it is less than or equal to the table value)
| NNN | Level of significance for a one-tailed test | |||||
|---|---|---|---|---|---|---|
| .10 | .05 | .025 | .01 | .005 | .001 | |
| Level of significance for a two-tailed test | ||||||
| .20 | .10 | .05 | .02 | .01 | .002 | |
| 4 | 0 | |||||
| 5 | 2 | 0 | ||||
| 6 | 4 | 2 | 0 | |||
| 7 | 6 | 3 | 2 | 0 | ||
| 8 | 8 | 5 | 3 | 1 | 0 | |
| 9 | 11 | 8 | 5 | 3 | 1 | |
| 10 | 14 | 10 | 8 | 5 | 3 | 0 |
| 11 | 17 | 13 | 10 | 8 | 5 | 3 |
| 12 | 21 | 17 | 13 | 10 | 7 | 5 |
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.