Comparing Two Independent Population Means · Exercise 32

At Rachel’s 11^th birthday party, eight guests were timed to see how long (in seconds) they could hold their breath in a relaxed position. After a two-minute rest, they timed themselves while jumping. The children thought that the mean difference between their jumping and relaxed times would be zero. Test their hypothesis.

$$\begin{array}{cc}\text{Relaxed time (seconds)}& \text{Jumping time (seconds)}\\ \text{26}& \text{21}\\ \text{47}& \text{40}\\ \text{30}& \text{28}\\ \text{22}& \text{21}\\ \text{23}& \text{25}\\ \text{45}& \text{43}\\ \text{37}& \text{35}\\ \text{29}& \text{32}\end{array}$$

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Introductory Business Statistics 2e · §10.1 Comparing Two Independent Population Means · Exercise 32