When using a t table,the degrees of freedom used for a t test for independent means is
A)the degrees of freedom for sample 1,divided by the sum of the degrees of freedom for both samples.
B)the average of the degrees of freedom for the two samples.
C)the sum of the two sample sizes,minus one.
D)the sum of the degrees of freedom for the two samples.

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When Using a T Table,the Degrees of Freedom Used for a T