Medical Statistics at a Glance
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Wiley-Blackwell

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Chapter 20, Question 1.
Paired t-test

Select all of the following statements which you believe to be true. The paired t-test is appropriate when:

The variable of interest is binary.
We want to compare two numerical variables when each is measured on every individual in the sample.
The differences between the pairs of observations are Normally distributed.
We wish to test the null hypothesis that the mean of the differences between the pairs of observations in the sample is equal to zero.
We wish to test the null hypothesis that the median of the differences between the pairs of observations in the population is equal to zero.