# Question: The average life expectancy for Bostonians is 78 1 years The

The average life expectancy for Bostonians is 78.1 years (The Boston Globe, August 16, 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 the 90% confidence interval for the population average life expectancy of Bostonians.

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

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

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

## Answer to relevant Questions

In order to estimate the mean 30-year fixed mortgage rate for a home loan in the United States, a random sample of 28 recent loans is taken. The average calculated from this sample is 5.25%. It can be assumed that 30-year ...A manager is interested in estimating the mean time (in minutes) required to complete a job. His assistant uses a sample of 100 observations to report the confidence interval as [14.355, 17.645]. The population standard ...Consider a normal population with an unknown population standard deviation. A random sample results in = 48.68 and s2 = 33.64.a. Compute the 95% confidence interval for µ if and s2 were obtained from a sample of 16 ...The Sudoku puzzle has recently become very popular all over the world. It is based on a 9 x 9 grid and the challenge is too ill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through ...An associate dean of a university wishes to compare the mean on the standardized final exams in microeconomics and macroeconomics. He has access to a random sample of 40 scores from each of these two courses. A portion of ...Post your question