A sample of 120 homes sold recently in a big city gave the mean price of homes equal to $270,000 and the standard deviation equal to $70,000.
(a) What is the point estimate of the mean price of all homes in the big city?
(b) Construct a 99% confidence interval for the mean price of all homes in the big city.
(c) Explain the advantage of the confidence interval over the point estimate.