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Two independent simple random samples are taken to test the difference between the means of two...

Two independent simple random samples are taken to test the difference between the means of two populations whose standard deviations are not known, but are assumed to be equal. The sample sizes are n 1 = 25 and n 2 = 30. The correct distribution to use is the  t  distribution with _____ degrees of freedom.

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Answer #1

Degree of freedom =n1+n2-2

=25+30-2

=53

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