A 90% Confidence Interval Is Constructed for the Population Mean

Multiple Choice

A 90% confidence interval is constructed for the population mean. If a 95% confidence interval had been constructed instead (everything else remaining the same) , the width of the interval would have been ________ and the probability of making an error would have been ________.

A) wider; bigger
B) wider; smaller
C) narrower; bigger
D) narrower; smaller