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

Multiple Choice

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