Mathematics, 17.04.2020 02:28 ronnie7898

A company that manufactures light bulbs claims that its light bulbs last an average of 1150 hours. A sample of 25 light bulbs manufactured by this company gave a mean life of 1090 hours with a standard deviation of 85 hours. The significance level is 5%. A consumer research group wants to test the hypothesis that the mean life of light bulbs manufactured by this company is less than 1150 hours. What is the value of the test statistic, t? Assume that the population is normally distributed.

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