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light bulbs is 42 months...

A manufacturer claims that the mean lifetime, μ, of its light bulbs is 42 months. The standard deviation of these lifetimes is 9

months. Thirty-five bulbs are selected at random, and their mean lifetime is found to be 41 months. Assume that the population is normally distributed. Can we conclude, at the 0.1 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 42 months?Type of Statistic: Z, t, Chi Square or FPerform a two-tailed test. Then fill in the table below.Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table.

months. Thirty-five bulbs are selected at random, and their mean lifetime is found to be 41 months. Assume that the population is normally distributed. Can we conclude, at the 0.1 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 42 months?Type of Statistic: Z, t, Chi Square or FPerform a two-tailed test. Then fill in the table below.Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table.

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