Four brands of flashlight batteries are to be compared by testing each brand in five flashlights. Twenty flashlights are

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Four Brands Of Flashlight Batteries Are To Be Compared By Testing Each Brand In Five Flashlights Twenty Flashlights Are 1 (69.39 KiB) Viewed 237 times

Four brands of flashlight batteries are to be compared by testing each brand in five flashlights. Twenty flashlights are randomly selected and divided randomly into four groups of five flashlights each. Then each group of flashlights uses a different brand o battery. The lifetimes of the batteries, to the nearest hour, are as follows. Brand A Brand B Brand C Brand D 42 28 24 20 30 36 36 32 39 31 28 28 28 32 28 28 29 27 33 25 Preliminary data analyses indicate that the independent samples come from normal populations with equal standard deviations. Use the 5% significance level. What is F value up to two decimal points?