1. The following information is based on independent random samples taken from two normally distributed populations having equal variances: n1 = 17 n2 = 18 1 = 579 2 = 591 s1 = 29.6 s2 = 26.9

Based on the sample information, determine the 95% confidence interval estimate for the difference between the two population means.

Read the t critical value and write df:

Calculate the pooled standard deviation:

Calculate the confidence 95 % interval