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The National Quality Research Center at the University of Michigan provides a quarterly 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?
What is samplings and its methods
Budgetary accounts Accounts used to go through the adopted budget into the all-purpose ledger as part of the administration control method of formal budgetary addition.
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I will need to upload the question sheets.
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How does the t-distribution changes its shape with the change of the size of the sample?
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