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What conditions are necessary in order to use the dependent samples t​-test for the mean of...

What conditions are necessary in order to use the dependent samples t​-test for the mean of the difference of two​ populations? Choose the correct answer below.

A.

Each sample must be randomly selected from any population and the two samples must be independent.

B.

Each sample must be randomly selected from any population and each member of the first sample must be paired with a member of the second sample.

C.

Each sample must be randomly selected from a normal population and the two samples must be independent.

D.

Each sample must be randomly selected from a normal population and each member of the first sample must be paired with a member of the second sample.

Math   Statistics-And-Probability   
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