Two Means - Matched Pairs (Dependent Samples): Videos & Practice Problems

A matched-pair study records the number of times participants woke up at night before and after drinking chamomile tea. The differences (before - after) for $8$ participants have a mean $\bar{d}=-1.5$ and standard deviation $S_d=1.2$. Find the test statistic $t$ for testing whether chamomile tea reduces nighttime awakenings.