Question: The National Quality Research Center

The National Quality Research Center at the University of Michigan provides a quarterly measure of consumer opinions about products and services ( The Wall Street Journa l , 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.

1. 
   Explain what assumption the researcher should be willing to make if a margin of error is desired.
2. Using 95% confidence, determine the margin of error.
   
3. . Determine the margin of error if 99% confidence is desired.

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