Two Independent Simple Random Samples Are Taken to Test the Difference

question 62

Multiple Choice

Two independent simple random samples are taken to test the difference between the means of two populations whose variances are not known, but are assumed to be equal. The sample sizes are n₁ = 31 and n₂ = 40. The correct distribution to use is the t distribution with _____ degrees of freedom.

• A) 73
• B) 72
• C) 71
• D) 69

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