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?
a. 2
b. There is a .95 probability that the sample mean will provide a margin of error of 4.022 minutes or less.
c. 40.98 to 49.02 minutes (rounded)
d. 121
You might also like to view...
To the maker of a note, the note is a(n) ____________________
Fill in the blank(s) with correct word
Initiators are those who authorize the proposed action of deciders or buyers
Indicate whether the statement is true or false
Low costs of conformance usually result in high costs of nonconformance
Indicate whether the statement is true or false
To provide accurate performance appraisals, Samantha keeps a box of index cards on each of her employees. When an employee does something particularly well or particularly poorly, Samantha writes the event down on a card and puts it in that employee’s box. It appears Samantha is using the ______ method of performance appraisal.
A. critical incidents B. management by objectives C. narrative method D. behavioral anchored rating E. qualitative method