Can the main effect of diet on weight loss be interpreted? If so, interpret the main effect, using the α = 0.01 level of significance. If not, explain why not.

Exercises 8–10 refer to the following data:
As part of a study on weight loss, random samples of men and women were assigned to follow one of three diets. After several weeks, the amount of weight lost, in pounds, was recorded for each person. A two-way analysis was performed, with gender and diet as the factors, and weight loss as the response. The following MINITAB output presents the ANOVA table.

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Analysis of Variance for Weight Loss Source DF SS MS F P Gender 1 496.13 496.13 19.649 0.000 Diet 2 40.2 Interaction 2 534.47 20.1 267.23 0.79604 0.463 10.583 0.001 Error 24 606 25.25 Total 29 1676.8