Independent Simple Random Samples Are Taken to Test the Difference

Multiple Choice

Independent simple random samples are taken to test the difference between the means of two populations whose variances are not known. The sample sizes are n₁ = 32 and n₂ = 40. The correct distribution to use is the

A) binomial distribution
B) t distribution with 72 degrees of freedom
C) t distribution with 71 degrees of freedom
D) t distribution with 70 degrees of freedom