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Determine the number of degrees of freedom for the two-sample t test or CI in each...

Determine the number of degrees of freedom for the two-sample t test or CI in each of the following situations. (Round your answers down to the nearest whole number.)

(a)    m = 12, n = 15, s1 = 5.0, s2 = 6.0


(b)    m = 12, n = 21, s1 = 5.0, s2 = 6.0


(c)    m = 12, n = 21, s1 = 2.0, s2 = 6.0


(d)    m = 10, n = 24, s1 = 5.0, s2 = 6.0

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