A test for equality of two variances has sample sizes n1 = 13 and n2 = 10. The degrees of freedom for the test are

18) A test for equality of two variances has sample sizes n1 = 13 and n2 = 10. The degrees of freedom for the test are
A. 21.
B. 13 and 10.
C. 26.
D. 12 and 9.
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