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A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 775 hours. A random sample of
A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 775 hours. A random sample of 24 light bulbs has a mean life of 753 hours. Assume the population is normally distributed and the population standard deviation is 63 hours. At a = 0.02, do you have enough evidence to reject the manufacturer's claim? Complete parts (a) through (e). (@) Identify the null hypothesis and alternative hypothesis. O A. Ho: H # 775(claim) O B. Ho: US 753 O C. Ho: H 753 (claim) Ha: H 2 753 CD. Ho: H 2 775 (claim) O E. Ho: H > 775 OF. Ho: H= 753 Ha: H
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