Question

a health psychologist tests a new intervention to determine if it can change healthy behaviors among siblings. a) test whether or not the number of healthy behaviors differe at a 0.05 level of significance. b) compute effect size usinf eta-squared

A health psychologist tests a new intervention to determine if it can change healthy behaviors among siblings. To conduct the this test using a matched-pairs design, t researcher gives one sibling an intervention, and the other sibling is given a control task without the intervention. The number of healthy behaviors observed in the si during a 5-minute observation were then recorded. Intervention Yes No 6 4 3 4 6 6 4 6 5 4 (a) Test whether or not the number of healthy behaviors differ at a 0.05 level of significance. State the value of the test statistic. (Round your answer to three decimal places.) State the decision to retain or reject the null hypothesis. O Retain the null hypothesis. O Reject the null hypothesis. (b) Compute effect size using eta-squared. (Round your answer to two decimal places.)

Answer 1

de4es- NO hypothesis Ho Md0 are belay for the oud put d paiad t-test,C Giver test statisGc CE= 1.58 degrees of teado: db n-1-5 Pvalues 0.I747 ue fail t P-Valere is radter than o.05 hypotheris reject the null the etbect Sizeis 1-O cohem sd- O.5/5 Sat 3-77 3-77 foom beloro toble

Diff (T2-T1) Dev (Diff M) Treatment 1 Treatment 2 Sq. Dev 4,5,4,5,4,4 -2 1 6,3,6,6,6,5 2 -2 1 -1 -2 -1 1 M:-1 S: 12 Difference Scores Calculations Significance Level: Mean:-1 0.01 0.05 S2 = SSdf= 12/(6-1) 2.4 0.10 S2M S2IN 2.4/6 0.4 One-tailed or two-tailed hypothesis? SM= VS2M= V0.4 0.63 One-tailed T-value Calculation Two-tailed t (M-H)ISM= (-1 - 0)/0.63 = -1.58 The value of tis -1.581139. The value of p is .17469. The result is not significant at p < .05. ㅜ31010