If a sample of size 41 is selected,the value of A for the probability P(-A ≤ t ≤A)= 0.90 is:
A)1.303
B)1.684
C)2.021
D)2.423

Question

Quizplus · Accepted Answer

The value of A for a given probability in a t-distribution depends on the degrees of freedom (which is the sample size minus one for a single sample) and the desired level of confidence. For a sample size of 41, the degrees of freedom (df) is 40. Looking up the t-distribution table for a two-tailed test with a confidence level of 90% (or a significance level of 0.10) and df = 40, the closest value is 1.684.

If a Sample of Size 41 Is Selected,the Value of a for the Probability