A survey by Accountemps asked a sample of 200 executives to provide data on the numberof minutes per day office workers waste trying to locate mislabeled, misfiled, or misplaceditems. Data consistent with this survey are contained in the data file ActTemps.
a. Use ActTemps to develop a point estimate of the number of minutes per day officeworkers waste trying to locate mislabeled, misfiled, or misplaced items.
b. What is the sample standard deviation?
c. What is the 95% confidence interval for the mean number of minutes wasted per day?
Mileage tests are conducted for a particular model of automobile. If a 98% confidence intervalwith a margin of error of 1 mile per gallon is desired, how many automobiles shouldbe used in the test? Assume that preliminary mileage tests indicate the standard deviationis 2.6 miles per gallon.