Question 16.55

16.55 Retail sales.

Exercise 7.97 (page 411) gives monthly sales of 64GB flash drives at a sample of 50 retail stores. That exercise reports 95% confidence intervals for the mean sales in all stores obtained by the bootstrap method, which does not require Normality. Find a 95% confidence interval for the median sales and compare your results with those in Exercise 7.97.

retail

16.55

(25, 32). This is quite close to the confidence interval for the mean we found in Exercise 7.97, (26.06, 33.18).