Three packaging materials were tested for moisture retention by storing the same food product in each for a fixed period of time and then determining the moisture loss. Each material was used to wrap 10 food samples. The results are given in the accompanying table.

(a) Construct the ANOVA table.

(b) Can we reject the hypothesis that the materials are equally effective? Use α = .05.

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Number of packages Mean loss Sample variance Material 1 10 231 40 Material 2 10 238 38 Material 3 10 224 30