Two independent samples of sizes 40 and 50 are randomly selected from two populations to test the difference between the population means 
. Assume the population variances are known. The sampling distribution of the sample mean difference 
is:
A) normally distributed.
B) approximately normal.
C) Student t-distributed with 88 degrees of freedom.
D) None of these choices.
Correct Answer:
Verified
Q24: The quantity Q28: If we are testing for the difference Q30: In comparing two population means of Q32: When testing Q33: Two independent samples of sizes 20 and Q35: Two independent samples of sizes 25 and Q39: In testing the difference between the means Q40: In constructing a confidence interval estimate for Q68: When comparing two population means using Q100: The number of degrees of freedom associated
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