Which of the following are conditions that must apply to use a paired t-test?

You have been tasked with ascertaining if two sets of data differ considerably. You will make use of Azure Machine Learning Studio to complete your task.
You plan to perform a paired t-test.
Which of the following are conditions that must apply to use a paired t-test? (Choose all that apply.)
A. All scores are independent from each other.
B. You have a matched pairs of scores
C. The sampling distribution of d is normal
D. The sampling distribution of x1- x2 is normal.

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