Question: 8. One sample has n = 15 with 55 = 1660, and a second sample has n = 15 with 55 = 1700. a. Find

8. One sample has n = 15 with 55 = 1660, and a second sample has n = 15 with 55 = 1700.

a. Find the pooled variance for the two samples.

b. Compute the estimated standard error for the sample mean difference.

c. If the sample mean difference is 8 points, is this enough to reject the null hypothesis and conclude that there is a significant difference for a two-tailed test at the .05 level?

d. If the sample mean difference is 12 points, is this enough to indicate a significant difference for a two-tailed test at the .05 level?

e. Calculate the percentage of variance accounted for

(r ) to measure the effect size for an 8-point mean difference and for a 12-point mean difference.

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