Question: An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 800 hours and a standard deviation

An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 800 hours and a standard deviation of 40 hours. Test the hypothesis that p = 800 hours against the alternative p ≠ 800 hours if a random sample of 30 bulbs has an average life of 788 hours. Use a P-value in your answers.

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