Consider the following data for two independent random samples taken from two normal populations.

sample 1: 10 7 13 7 9 8

sample 2: 8 7 8 4 6 9

a. compute the two sample means.

sample 1: answer

sample 2: answer

b. compute the two sample standard deviation (to 2 decimals).

sample 1: answer

sample 2: answer

c. what is the point estimate of the difference between the two population means?

answer

d. what is the 90% confidence interval estimate of the difference between the two population means (to 2 decimals - - use 9 degrees of freedom)?

( answer , answer )