Question

State whether each of the following changes would make a confidence interval wider or narrower. (Assume that nothing else changes.)
a. Changing from a 90% confidence level to a 99% confidence level.
b. Changing from a sample size of 30 to a sample size of 200.
c. Changing from a standard deviation of 20 pounds to a standard deviation of 25 pounds.


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  • CreatedJuly 16, 2015
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