Supermarket Prices In Exercise 11.43 (and data set EX1143), we compared the regular...

Supermarket Prices In Exercise 11.43 (and data set EX1143), we compared the regular prices at four different grocery stores for eight items purchased on the same day. The prices are listed in the table.

a. Does the distribution of the prices differ from one supermarket to another? Test using the Friedman Fr-test with α = .05.

b. Find the approximate p-value for the test and interpret it.

Reference:

Where to Shop? Do you shop at the grocery store closest to home or do you look for the store that has the best prices? We compared the regular prices at four different grocery stores for eight items purchased on the same day.

a. What are the blocks and treatments in this experiment?

b. Do the data provide evidence to indicate that there are significant differences in prices from store to store? Support your answer statistically using the ANOVA printout that follows.

c. Are there significant differences from block to block? Was blocking effective?