Regression Analysis
John Herr is an analyst for the Best Foods grocery chain. The firm operates four grocery stores. John is interested in knowing if the average dollar amount per purchase is identical for the four stores. John randomly selected six receipts from each of the four stores:
|
Store 1 |
Store 2 |
Store 3 |
Store 4 |
| 13.05 |
16.17 |
9.48 |
9.52 |
| 23.94 |
18.52 |
6.92 |
10.92 |
| 14.63 |
19.57 |
10.47 |
11.12 |
| 25.78 |
21.40 |
7.63 |
9.32 |
| 17.52 |
13.59 |
11.90 |
12.73 |
| 18.45 |
20.57 |
9.92 |
8.92 |
a. Use SPSS to perform an ANOVA on this data.
b. What are the null and alternative hypotheses?
c. Is there support in this data for the notion that average dollar amount per purchase is the same for all stores?
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