Nancy, Inc. has three stores located in three different areas. Random samples of the sales of the three stores (in $1000) are shown below. Please note the sample sizes are not equal.
Store 1
Store 2
Store 3
46
34
33
47
36
31
45
35
35
42
39
45
?
a.Compute the overall mean 
.b.At a 5% level of significance, test to see if there is a significant difference in the average sales of the three stores.
What will be an ideal response?
a. 39b.
| Source of Variation | SS | df | MS | F | p-value | F critical |
| Between Groups | 324 | 2 | 162 | 40.5 | 0.00003 | 4.26 |
| Within Groups | 36 | 9 | 4 | |||
| Total | 360 | 11 |
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