Now suppose that we did not feel comfortable assuming that = 7.20. Use the scores in
Question:
Now suppose that we did not feel comfortable assuming that σ = 7.20. Use the scores in problem 9 to
a. Estimate the standard error of the sample mean (sX̅).
b. Find the 95% confidence interval for the mean.
c. Find the 99% confidence interval for the mean.
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Solution a The standard deviation of the sample is lx sX the sample mean is 720 sX Xn 7207...View the full answer
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Related Book For 
Elementary Statistics In Social Research
ISBN: 9780205845484
12th Edition
Authors: Jack A. Levin, James Alan Fox, David R. Forde
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