What critical value would be appropriate for a 98% confidence interval on a mean where σ is unknown if the sample size is 10 and the population is normally distributed?
A) 2.8214
B) 2.7638
C) 1.3830
D) 2.3263

Question

Quizplus · Accepted Answer

For a 98% confidence interval with a sample size of 10, we use the t-distribution with 9 degrees of freedom. The critical value for t with 9 degrees of freedom at 98% confidence is approximately 2.8214.

What Critical Value Would Be Appropriate for a 98% Confidence