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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 s=5.
a. Explain what assumption the researcher should be willing to make if a margin of error is desired.b. Using 95% confidence, determine the margin of error.c. Determine the margin of error if 99% confidence is desired.
Can some one give me an example of how to round a percent to one decimal and two decimal?
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