A company has test-marketed three new types of soup in selected stores over a period of 1 year. The following table records sales achieved (in thousands of dollars) for each of the three soups in each quarter of the year.
Soup
Quarter
A
B
C
1
47
57
65
2
63
76
3
79
67
54
4
52
50
49
a. Prepare the two-way analysis of variance table.
b. Test the null hypothesis that population mean sales are the same for all three types of soup.
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