Lifetime of light bulbs by manufacturer varies from months

Reference no: EM13129261

Manufacturer claims that the mean lifetime, , of its light bulbs is months. The standard deviation of these lifetimes is months. Forty-five bulbs are selected at random, and their mean lifetime is found to be months. Assume that the population is normally distributed. Can we conclude, at the level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from months?

Reference no: EM13129261

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