Two separate samples, each with n=15 individuals, receive different treatments. After treatment, the first sample has so=1740 and the second sample has so=1620. Find the pooled variance for the two samples 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