A Consumer Testing Lab Wants to Compare the Mean Life $\alpha$

A consumer testing lab wants to compare the mean life of AA batteries produced by different manufacturers. Five brands of batteries are selected, and for each brand, 20 batteries are randomly sampled. The lab then tests for the life time of each battery (in hours), and compares the average battery life of different brands using ANOVA. Complete the following one-factor ANOVA summary table using $\alpha$ = .05. Based on the results, do batteries of different brands have different life times?
$\begin{array}{llllll}\hline \text { Source } & S S & d f & M S & F & \text { Critical Value and Decision } \\\hline \begin{array}{l}\text { Between } \\\text { Within }\end{array} & & & 10 & & \\\text { Total } & 1110 & & & & \\\hline\end{array}$

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There are 5 brands, so J=5. Each brand h...

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