The National Center for Quality Research at the University of Michigan provides measurements

Quarterly consumer opinions about goods and services. In a

survey of 10 fast food restaurants, the sample average of the Satisfaction Index of

client was 71. Previous data indicates that the population standard deviation has been

relatively stable, with = 5.

a) What should the researcher be willing to assume to consider if a margin of error is

desirable?

b) With 95% confidence, what is the specific error?

c) What is the error of determining if you want 99% confidence?