What is the point estimate of the population mean

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Question: The average life expectancy for Bostonians is 78.1 years (The Boston Globe, August 1 6 , 2010). Assume that this average was based on a sample of 50 Bostonians and that the population standard deviation is 4.5 years.

a. What is the point estimate of the population mean?

b. At 90% confidence, what is the margin of error?

c. Construct a 90% confidence interval for the population average life expectancy of Bostonians.

Reference no: EM131460876

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