State whether each of the following changes would make a confidence interval wider or narrower. (Assume that
Question:
a. Changing from a 95% level of confidence to a 90% level of confidence.
b. Changing from a sample size of 30 to a sample size of 20.
c. Changing from a standard deviation of 3 inches to a standard deviation of 2.5 inches.
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Related Book For
Introductory Statistics Exploring The World Through Data
ISBN: 9780321978271
2nd Edition
Authors: Robert Gould, Colleen Ryan
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