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A random sample of 56 fluorescent light bulbs has a mean life of 645 hours. Assume the population standard deviation is 31 hours. Construct a 95% confidence interval for the population mean life of the light bulbs. A random sample of 20 college students at STC has a mean annual earnings of $3140 with a sample standard deviation of $686. Construct a 98% confidence interval for the population mean. Assume the population has a normal distribution. In a survey of 250 La Plaza Mall shoppers in McAllen, Texas, 80 shoppers said they usually eat at the food court in the mall. Construct a 90% confidence interval for the population proportion of La Plaza Mall shoppers that eat at the mall food court.

          
            A random sample of 56 fluorescent light bulbs has a mean life of 645 hours. Assume the population standard deviation is 31 hours. Construct a 95% confidence interval for the population mean life of the light bulbs.

A random sample of 20 college students at STC has a mean annual earnings of $3140 with a sample standard deviation of $686. Construct a 98% confidence interval for the population mean. Assume the population has a normal distribution.

In a survey of 250 La Plaza Mall shoppers in McAllen, Texas, 80 shoppers said they usually eat at the food court in the mall. Construct a 90% confidence interval for the population proportion of La Plaza Mall shoppers that eat at the mall food court.

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a random sample of 56 fluorescent light bulbs has mean life of 645 hours assume the population standard deviation is 31 hours construct 95 confidence interval for the population mean life of 55515

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For the light bulbs, we have a sample size of 56, a sample mean of 645 hours, and a population standard deviation of 31 hours. We want to construct a 95% confidence interval for the population mean. The formula for a confidence interval for the population mean Show more…

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