15 **Question 14** Compared to an independent-measures design, a repeated-measures study is more likely to find a statistically significant effect because it reduces the contribution of variance due to - time-related factors. - order effects. - the effect of the treatment. - individual differences. **Question 15** A repeated-measures experiment and a matched-subjects experiment each produce a t-statistic with df = 19. How many individuals participated in each study? - 20 for repeated and 20 for matched. - 20 for repeated and 40 for matched. - 20 for repeated and 21 for matched. - 20 for repeated and 21 for matched. **Question 16** A researcher reports an independent-measures t-statistic with degrees of freedom = 36. How many participants were in the entire study? - 19 - 38 - 37 - 72

15) Solution: Given : The degree of freedom for repeated measure experiment and a matched subjects experiment eah is Degree of freedom= df= 19 To find the number of individual participated in each study. The degree of freedom for repeated measure experiment is Degree of freedom = df = n-1 19 = n-1 n= 19+1= 20 20 individual participated in repeated measure experiment study. The degree of freedom for matched subject experiment is Degree of freedom = df = n-1 19 = n-1 n= 19+1= 20 20 individual participated in matched subject experiment 20 for repeated and 20 for matched Option A is Correct