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Problem 3
Grocery costs vary for different families, but a researcher wants to study the weekly cost of groceries for typical Florida families at four different grocery chains in South Florida. To do this the researcher looks at weekly costs for groceries at the four stores for four different families. Each family will visit a different one of the four stores to shop each week for a month. The families will randomly be assigned to the stores each week. Use the data below and a 2.5% significance level to test the claim that the four stores have different average grocery prices.
Store
Family Publix Target Costco Whole Foods
1 210 195 200 315
2 300 250 275 400
3 176 171 189 223
4 148 127 130 162