A random sample of 50 observations on the waiting time (in seconds) of customers before speaking to

Question:

A random sample of 50 observations on the waiting time (in seconds) of customers before speaking to a representative at a call center is as follows:

(a) Construct a histogram and comment on the process.
(b) What assumptions are necessary to test if the mean waiting time is less than 32 seconds?
(c) Make an appropriate transformation to satisfy the assumption stated in part (b) and validate it. Use a = 0.05.
(d) Test to determine if the mean waiting time is less than 32 seconds. Use Î± = 0.05.
(e) Find a 90% confidence interval for the variance of waiting time.