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A company that produces light bulbs is concerned about the distribution of the life expectancy of the bulbs. The company takes a simple random sample of 100 bulbs and computes the sample mean to be X = 950 hours per bulb. a. Construct a 95% confidence interval for the unknown mean life expectancy assuming that the population standard deviation is 30 hours. (3 marks) b. Interpret the 95% confidence interval found in (a)..

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A company that produces light bulbs is concerned about the distribution of the life expectancy of the bulbs. The company takes a simple random sample of 100 bulbs and computes the sample mean to be X = 950 hours per bulb. a. Construct a 95% confidence interval for the unknown mean life expectancy assuming that the population standard deviation is 30 hours. (3 marks) b. Interpret the 95% confidence interval found in (a).

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  • 1. A company that produces light bulbs is concerned about the distribution of the life expectancy of the bulbs. The company takes a simple random sample of 100 bulbs and computes the sample mean to be X = 950 hours per bulb. a. Construct a 95% confidence interval for the unknown mean life expectancy assuming that the population standard deviation is 30 hours. (3 marks) b. Interpret the 95% confidence interval found in (a).