A random sample of 49 lunch customers was taken at a restaurant. The average amount of time these customers stayed in the restaurant was 45 minutes with a standard deviation of 14 minutes.
a. Compute the standard error of the mean.
b. With a .95 probability, what statement can be made about the size of the margin of error?
c. Construct a 95 confidence interval for the true average amount of time customers spent in the restaurant.
d. With a .95 probability, how large of a sample would have to be taken to provide a margin of error of 2.5 minutes or less?
Question 2
A production process that is in control has a mean () of 200 and a standard deviation () of 22. Determine the lower and the upper control limits for sample sizes of 49.
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