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An Agricultural Scientist Performs a 2-Way ANOVA to Determine the Effects

Question 44

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An agricultural scientist performs a 2-way ANOVA to determine the effects of three different soil mixtures on the sprouting time (in days) of three varieties of hybrid cucumber seeds. The following MINITAB output presents the results.  Analysis of Variance for Sprouting  Source  DF  SS  MS  F  P  Soil Mixture 212.5185196.2592593.448980.053948 Hybrid Variety 23.1851851.5925930.8775510.432852 Interaction 46.370371.5925930.8775510.496728 Error 1836.6666671.814815 Total 2654.740741\begin{array}{l}\text { Analysis of Variance for Sprouting }\\\begin{array} { l r r r r r } \text { Source } & \text { DF } & \text { SS } & \text { MS } & \text { F } & \text { P } \\\text { Soil Mixture } & 2 & 12.518519 & 6.259259 & 3.44898 & 0.053948 \\\text { Hybrid Variety } & 2 & 3.185185 & 1.592593 & 0.877551 & 0.432852 \\\text { Interaction } & 4 & 6.37037 & 1.592593 & 0.877551 & 0.496728 \\\text { Error } & 18 & 36.666667 & 1.814815 & & \\\text { Total } & 26 & 54.740741 & & &\end{array}\end{array} i). Can you reject the hypothesis of no interactions?
ii). Can the mean effect of the soil mixture be interpreted? If so, interpret the main effect. Use the α = 0.01 level of significance.
iii). Can the mean effect of the hybrid variety be interpreted? If so, interpret the main effect. Use the α = 0.01 level of significance.

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i). No.
ii). Yes. Do...

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