A sample of size n=22 is drawn from a normal population. Find the critical value $t _ { \alpha / 2 }$ needed to construct a 98 % confidence interval.
A) 2.326
B) 2.508
C) 2.189
D) 2.518

Question

A sample of size  n=22  is drawn from a normal population. Find the critical value $t _ { \alpha / 2 }$ needed to construct a  98 %  confidence interval.
A)  2.326 
B)  2.508 
C)  2.189 
D)  2.518

Quizplus · Accepted Answer

For a 98% confidence interval with a sample size of 22, the degrees of freedom is 21. Using a t-distribution table, the critical value $t_{\alpha/2}$ for 21 degrees of freedom at a 98% confidence level is approximately 2.518.

A Sample of Size N=22 Is Drawn from a Normal