To better understand eating patterns that might contribute to obesity, a researcher measures the average number of calories (per meal) consumed by shift workers (morning, afternoon, night) during two seasons (summer and winter). The hypothetical results are given in the following table.

(a) Complete the F table and make a decision to retain or reject the null hypothesis for each hypothesis test.
(b) Explain why post hoc tests are not necessary.

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Shift Morning Afternoon Night 480 660 570 510 Summer 450 500 550 650 500 700 Season 710 630 600 650 Winter 700 550 750 700 500 750 600