We do this by finding out if the arm with medicated lotion has less redness than the other arm. We want to know if the medicated lotion is better than the non-medicated lotion. After a week, a doctor measures the redness on each arm. ![]() A group of people with dry skin use a medicated lotion on one arm and a non-medicated lotion on their other arm.We also have an idea, or hypothesis, that the differences between pairs is zero. Other times, we have separate variables for “before” and “after” measurements for each pair and need to calculate the differences. Sometimes, we already have the paired differences for the measurement variable. One variable defines the pairs for the observations. ![]() For the paired t-test, we need two variables.
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