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(Solved): A consumer advocate researches the length of life between two brands of refrigerators, Brand A and ...




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A consumer advocate researches the length of life between two brands of refrigerators, Brand A and Brand B. He collects data (measured in years) on the longevity of 40 refrigerators for Brand and repeats the sampling for Brand B. A portion of the data is shown in the accompanying table. (You may find it useful to reference the appropriate table: ztable or ttable) Click here for the Excel Data File Assume that is the mean longevity for Brand and is the mean longevity for Brand . a. Select the competing hypotheses to test whether the average length of life differs between the two brands. b-1. Calculate the value of the test statistic. Assume that and . (Negative value should be indicated by a minus sign. Round final answer to 2 decimal places.)


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