A researcher investigated salivary cortisol levels (in nmol/L) in two independent groups after a 4-week wellness intervention. Group A participated in high-intensity interval training (Na=16N_a = 16Na=16) and Group B participated in restorative yoga (Nb=15N_b = 15Nb=15). A Mann-Whitney U test was carried out to determine if there was a significant difference in cortisol levels between the two groups.
The researcher used a two-tailed (non-directional) test with a 5% level of significance (p≤0.05p \le 0.05p≤0.05) and determined the observed (calculated) value of U U\,U to be 73.
Explain what this shows in terms of the difference in salivary cortisol levels between the high-intensity interval training and restorative yoga groups.
| NaN_aNa | Nb=12N_b = 12Nb=12 | Nb=13N_b = 13Nb=13 | Nb=14N_b = 14Nb=14 | Nb=15N_b = 15Nb=15 | Nb=16N_b = 16Nb=16 | Nb=17N_b = 17Nb=17 | Nb=18N_b = 18Nb=18 |
|---|---|---|---|---|---|---|---|
| 15 | 51 | 56 | 61 | 64 | 70 | 75 | 81 |
| 16 | 55 | 61 | 66 | 70 | 75 | 81 | 87 |
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.