Confidence interval for the population mean: Use of the standard normal. The union for a particular industry has determined that the standard deviation of the daily wages of its workers is 19. A random sample of 90 workers in this industry has a mean daily wage of $113. Find a 90% confidence interval for the true mean daily wage of all union workers in the industry. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
(If necessary, consult a list of formulas.)
What is the lower and upper limit of the 90% confidence interval?