Question

Sheer industries is considering a new computer-assisted program to train maintenance employees to do machine repairs. In order to fully evaluate the program, the director of manufacturing requested an estimate of the population mean time required for maintenance employees to complete the computer assisted training. Use 6.84 days as a planning value for the population standard deviation. (Round your answers up to the nearest whole number.)

A.) Assuming 95% confidence, what sample size would be required to obtain a margin of error of 0.5 days?

b.) If the precision statement was made with 90% confidence, what sample size would be required to obtain a margin of error of 2 days?

A survey conducted by the American Automobile Association showed that a family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls resulted in a sample mean of $256.45 per day and a sample standard deviation of $74.50.

Develop a 95% confidence interval estimate of the mean amount spent per day in dollars by a family of four visiting Niagara Falls. (Round your answers to the nearest cent.)

_____$ to ________$

Answer 1