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As head of a consumer research group, you have been given the responsibility for testing and...

As head of a consumer research group, you have been given the responsibility for testing and comparing the lifetimes of light bulbs for four brands of bulbs. You test the lifetimes of three bulbs of each of the four brands. The test results are shown below measured in hundreds of hours.

A                     B                     C                     D

20                    25                    24                    23

19                    23                    20                    20

21                    21                    22                    20

Can we assume that the lifetimes of the four brands are equal? Test at the 5% level of significance

Math   Statistics-And-Probability   
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