Comparing two groups

What the problems look like

A few statements from this skill. Answers, hints and worked solutions live in the practice session.

1. Warm-up

   In a matched-pairs study, the differences (Treatment 1 minus Treatment 2) in typing speed (words per minute) for 5 matched pairs are $-6, 3, -7, -8, 8$. Find the sample mean difference $\bar{d}$.

2. Warm-up

   In a matched-pairs study, the differences (Treatment 1 minus Treatment 2) in reaction time (milliseconds) for 5 matched pairs are $9, -14, 7, 10, -12$. Find the sample mean difference $\bar{d}$.

3. Warm-up

   In a matched-pairs study, the differences (Treatment 1 minus Treatment 2) in typing speed (words per minute) for 5 matched pairs are $12, 13, -6, 1, 5$. Find the sample mean difference $\bar{d}$.

Problems shown under their original terms: Generated (template, solver-computed).