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What are the degrees of freedom and the critical value?

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Calculate a 90% Confidence Interval for mu(1) - mu(2) with sample sizes n1 = 10 and n2 = 5. Assume equal population standard deviations.

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  1. ANSWER: df = 13

    Why???

    TWO-SAMPLE "POOLED" t-test

    df = n1 + n2 -2  (DEGREES OF FREEDOM)

    Normal populations or n1 + n2 > 40) and independent observations and σ1 = σ2 and (σ1 and σ2 unknown

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