If We Are Testing for the Difference Between the Means $n _ { 1 } = 20 \text { and } n _ { 2 } = 20$

question 41

Multiple Choice

If we are testing for the difference between the means of 2 independent populations presuming equal variances with samples of $n _ { 1 } = 20 \text { and } n _ { 2 } = 20$ , the number of degrees of freedom is equal to

• A) 39.
• B) 38.
• C) 19.
• D) 18.

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