John wants to compare two means.His sample statistics were and .Assuming equal variances,the test statistic is:
A) 2.37
B) 2.20
C) 1.96
D) Must know $\alpha$ to answer.

Question

Quizplus · Accepted Answer

To compare two means with equal variances, the appropriate test is the two-sample t-test. Using the given sample statistics and assuming equal variances, the test statistic is calculated as (7.2-4.4)/sqrt(((15-1)*2*1)/15 + ((13-1)*2*1)/13) = 2.20. Therefore, the best choice is B.

John Wants to Compare Two Means α\alphaα To Answer

John Wants to Compare Two Means $\alpha$ To Answer