Changes in Confidence
Interval State whether each of the following changes would make a confidence interval wider or narrower. (Assume that nothing else changes.)
a. Changing from an 80% level of confidence to an 85% level of confidence.
b. Changing from a sample size of 25 to a sample size of 40.
c. Changing from a standard deviation of 500 grams to a standard deviation of 750 grams.