Question: A theory-based test for comparing two means uses which of AD to approximate a null distribution? A. A normal distribution B. A t-distribution that is

A theory-based test for comparing two means uses which of A–D to approximate a null distribution? 

A. A normal distribution 

B. A t-distribution that is a bit wider (or heavier in the tails) than a normal distribution 

C. A t-distribution that is a bit narrower (or lighter in the tails) than a normal distribution 

D. Either a normal or a t-distribution as they are the same 

E. None of the above

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