Mathematics, 07.09.2020 19:01 orlando19882000

A manufacturer claims that the mean lifetime, u, of its light bulbs is 46 months. The standard deviation of these lifetimes is 8 months. One hundred fifty bulbs are selected at random, and their mean lifetime is found to be 48 months. Can we conclude, at the 0.05 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 46 months?

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A manufacturer claims that the mean lifetime, u, of its light bulbs is 46 months. The standard devia...

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