In the SAT example, for N = 12, the 95% confidence interval had a width of about
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In the SAT example, for N = 12, the 95% confidence interval had a width of about 115 points (the difference between the lower limit of 493.36 and the higher limit of 606.64). If we again use 100 as the estimate of the population standard deviation 
a. How large should the sample be for a desired width of 80 points rather than 115?
b. How large should the sample be for a desired width of 40 points rather than 115?
c. How large should the sample be for a desired width of 20 points rather than 115?
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Related Book For 
Fundamental Statistics For The Social And Behavioral Sciences
ISBN: 9781506377476
2nd Edition
Authors: Howard T Tokunaga
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