Multiple Choice
Two independent samples of sizes 40 and 50 are randomly selected from two populations to test the difference between the population means 
. Which of the following best describes the sampling distribution of the sample mean difference 
?
A) It is normally distributed.
B) It is approximately normal.
C) It is student t-distributed with 88 degrees of freedom.
D) It is student t-distributed with 90 degrees of freedom.
Correct Answer:
Verified
Correct Answer:
Verified
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