The National Quality Research Center at the University of Michigan provides a quarterly measure of consumer opinions abo
Posted: Sun Oct 03, 2021 3:32 pm
The National Quality Research Center at the University
of Michigan provides a quarterly measure of consumer opinions about
products and services. A survey of 50 restaurants in the Fast
Food/Pizza group showed a sample mean customer satisfaction index
of 59. Past data indicate that the population standard deviation of
the index is 4.
a) What is the name of the
variable?
b) What is the point estimate of the
population variance?
c) Using 95% confidence, what is the
margin of error?
d) Using the 90% confidence, find the
confidence interval of the population mean. Find the good samples
and bad samples area of this confidence interval using a
curve.
e) Find expected number of good
samples according to the above curve.
of Michigan provides a quarterly measure of consumer opinions about
products and services. A survey of 50 restaurants in the Fast
Food/Pizza group showed a sample mean customer satisfaction index
of 59. Past data indicate that the population standard deviation of
the index is 4.
a) What is the name of the
variable?
b) What is the point estimate of the
population variance?
c) Using 95% confidence, what is the
margin of error?
d) Using the 90% confidence, find the
confidence interval of the population mean. Find the good samples
and bad samples area of this confidence interval using a
curve.
e) Find expected number of good
samples according to the above curve.