SOLUTION: Using two independent samples, we test for a hypothesized difference between two population means. The population standard deviations are equal. The number in the first sample is f

Question 596022: Using two independent samples, we test for a hypothesized difference between two population means. The population standard deviations are equal. The number in the first sample is fifteen and the number in the second sample is twelve. How many degrees of freedom are associated with the critical value?
a.24
b.25
c.26
d.27
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Degrees of freedom:

df = n1 + n2 - 2

df = 15 + 12 - 2

df = 27 - 2

df = 25

So the answer is choice B

Note: the formula only works if the population standard deviations are equal
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