he National Quality Research Center at the University of Michigan provides a quarterly (6) measure of consumer opinions about products and services (The Wall Street Journal, February 18, 2003). A survey of 10 restaurants in the Fast Food/Pizza group showed a sample mean customer satisfaction index of 71. Past data indicate that the population standard deviation of the index has been relatively stable with σ = 5. a. What assumption should the researcher be willing to make if a margin of error is desired? b. Using 95% confidence, what is the margin of error? c. What is the margin of error if 99% confidence is desired
he National Quality Research Center at the University of Michigan provides a quarterly (6) measure of consumer opinions about products and services (The Wall Street Journal, February 18, 2003). A survey of 10 restaurants in the Fast Food/Pizza group showed a sample mean customer satisfaction index of 71. Past data indicate that the population standard deviation of the index has been relatively stable with σ = 5. a. What assumption should the researcher be willing to make if a margin of error is desired? b. Using 95% confidence, what is the margin of error? c. What is the margin of error if 99% confidence is desired
MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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The National Quality Research Center at the University of Michigan provides a quarterly (6)
measure of consumer opinions about products and services (The Wall Street Journal,
February 18, 2003). A survey of 10 restaurants in the Fast Food/Pizza group showed a
sample mean customer satisfaction index of 71. Past data indicate that the population standard
deviation of the index has been relatively stable with σ = 5.
a. What assumption should the researcher be willing to make if a margin of error is desired?
b. Using 95% confidence, what is the margin of error?
c. What is the margin of error if 99% confidence is desired?
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