The critical cutoffs for a 95 percent confidence interval are -1.96 and 1.96.What are the cutoffs for a 90 percent confidence interval?
A) -1.65 and 1.65
B) -1.76 and 1.76
C) -1.96 and 1.96
D) -2.12 and 2.12

Question

Quizplus · Accepted Answer

The critical values for a 90% confidence interval are -1.645 and 1.645. To find this value, we can use the t-distribution table or a calculator. The 90% confidence interval is narrower than the 95% confidence interval, so the cutoffs will be closer to the mean. Therefore, the correct answer is A) -1.65 and 1.65.

The Critical Cutoffs for a 95 Percent Confidence Interval Are