A hypothesis tests that two population means are equal. A sample of 10 with a standard deviation of 5 is selected from the first population and a sample of 15 with a standard deviation of 5 from the second population. Testing the claim at the 0.01 level, what is the critical value? Assume unequal standard deviations.
A) $\pm$2.861
B) $\pm$2.807
C) $\pm$2.787
D) $\pm$2.576

Question

Quizplus · Accepted Answer

The critical value for a two-tailed test at the 0.01 significance level with degrees of freedom calculated using the Welch-Satterthwaite equation is approximately $\pm$2.861.

A Hypothesis Tests That Two Population Means Are Equal ±\pm± 2861 B)

A Hypothesis Tests That Two Population Means Are Equal $\pm$ 2861
B)