In a left-tailed test comparing two means with unknown variances assumed to be equal,the test statistic was t = −1.81 with sample sizes of n1 = 8 and n2 = 12.The p-value would be
A)between .025 and .05.
B)between .01 and .025.
C)between .05 and .10.
D)Must know α to answer.

Question

Quizplus · Accepted Answer

The degrees of freedom for the test is n1 + n2 - 2 = 18. Using a t-distribution table or calculator, a t-value of -1.81 with 18 degrees of freedom corresponds to a p-value between 0.025 and 0.05 for a left-tailed test.

In a Left-Tailed Test Comparing Two Means with Unknown Variances