Question 2 (5 points) 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. What is the point estimate of the difference between the two population means? (1 point) b. Compute the two sample standard deviations. (2 points) C . What is the degrees of freedom for the t distribution? (1 point) d. What is the 90% confidence interval estimate of the difference between the two population means? (1 point)