Can you help me with this question. It seems easy, but can't get started.

5. We are given random samples from two separate populations. Let # and /2 be the popula- tion means of Population 1 and Population 2 respectively. We summarize several statistics of the two samples as follows (Assume sample sizes are large enough for normal based inference). Population 1 Population 2 sample size 40 60 sample mean 20 15 sample Std. Deviation 4 6 (a) Find a 90% confidence interval for /1. (5 points) (b) Compute a 95% confidence interval for / - /2. (5 points)(c) Perform a hypothesis test on Ho : #1 - p2 = 0 vs. H1 : 1 - p2 0. Show the remaining steps of the testing procedure and draw a conclusion about the plausibility of Ho- (5 point)