Two separate samples, each with n= 15 individuals, receive different treatments. After treatment, the first sample has SS= 1740 and the second sample has SS= 1620.

(a)Find the pooled variance for the two samples.

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

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 0.05 level?