When Testing For The Difference Between The Variances

When testing for the difference between the variances of two population with sample sizes of n1=8 and n2=10, the number of degrees of freedom are?

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When testing for the difference between the variances

Question
When testing for the difference between the variances of two population with sample sizes of n1=8 and n2=10, the number of degrees of freedom are?

find the cost of your paper