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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?
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Twenty years ago, entering male high school students of Central High could do an average of 24 pushups in 60 seconds. To see whether this remains true today, a random sample of 36
All parts should be answered as briefly as possible (quality not quantity!). A few sentences will suffice. Just get your opinions across succinctly. Unnecessarily long answers will
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Given the following pairs of random variables and compute the following sums. (NB: show your working table). 3 -7 2 10 6 11 10 12 15 14 (b) (c) (d) ?¦?2y
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What is regression analysis ? Discuss the relation between ''correlation coefficient'' and the ''regression coefficients''?
What do u mean by Vectors? Explain its types.
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