Is there a difference in the price of groceries sold by the two retailers Target and Walmart? The data set Groceries contains a sample of grocery items and their prices advertised on their respective websites on one specific day. (See Exercise 5.18). Create a 95% t confidence interval for the mean difference in prices. Is the outlier in the data influential?

5.18

5.18 Is there a difference in the price of groceries sold by the two retailers Target and Walmart? The data set Groceries contain, a sample of gro- cery items and their prices advertised on their respective websites on one specific day.

a) Compute summary statistics of the prices for each store.

b) Use the bootstrap to determine whether or not there is a difference

in the mean prices.

c) Createahistogramofthedifferenceinprices.Whatisunusualabout

Quaker Oats Life cereal?

d) Recompute the bootstrap percentile interval without this observa-

tion. What do you conclude?