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

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