Bootstrap t confidence interval for service center call

Chapter , Problem 16.25

(choose chapter or problem)

Bootstrap t confidence interval for service center call lengths. Return to or re-create the bootstrap distribution of the sample mean for the 80 service center call lengths in Exercise 16.14 (page 16-12). CALLS80 (a) What is the bootstrap estimate of the bias? Verify from the graphs of the bootstrap distribution that the distribution is reasonably Normal (some right-skew remains) and that the bias is small relative to the observed x. The bootstrap t confidence interval for the population mean m is therefore justified. (b) Give the 95% bootstrap t confidence interval for m. (c) The only difference between the bootstrap t and usual one-sample t confidence intervals is that the bootstrap interval uses SEboot in place of the formulabased standard error s 1n. What are the values of the two standard errors? Give the usual t 95% interval and compare it with your interval from part (b).