24. 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?

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Items Stores Vons Ralphs Stater Bros WinCo Salad mix, 360 g bag 3.99 2.79 1.99 1.78 Hillshire Farm Beef 4.29 4.29 3.99 2.50 Smoked Sausage, 420 g Kellogg's Raisin Bran, 4.49 5.49 4.49 3.15 750 g Kraft Philadelphia 2.99 3.19 2.79 1.48 Cream Cheese, 250 g Kraft Ranch Dressing, 3.19 3.49 3.49 1.48 450 mL Treetop Apple Juice, 2.99 3.49 3.49 1.58 2L Dial Bar Soap, Gold, 5.99 6.49 5.79 5.14 125 g Jif Peanut Butter, 5.15 5.49 4.79 4.34 Creamy, 850 g