An educational psychologist conducted a study to investigate whether a new mnemonic technique affects word recall scores. They used a non-directional hypothesis with a repeated measures design. Initially, 14 participants were recruited, but the data of 3 participants who showed zero change in recall scores were discarded. The remaining data were analyzed using the Wilcoxon Signed Ranks test.
Using the extract of the table of critical values for the Wilcoxon T Signed Ranks test below, determine the critical value for a two-tailed 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.