&. Based on these requilts, is there a significant difference between the performance for individuale versus the performance for groups? Use two-tailed test with a - 05.

b. Compute ine estimaied value of Cohen's d' to measure effect size for ibis shady'.
In. An independent-measures research sandy was weil compare two treatment conditions with n - 4 pourrict panis in each treatment. The first treatment had a mens of M - 58 with a variance uf $ 28, and the second treatment had A - 52 and st = 30, Do these data indicate a significant difference between the two treatments? Use a two tailed test with a = 05. (Nowe"
Because the two samples are the same size, the pooled variance is simply the average of the two cumple variances,)