CALCULATE BY HAND THE TEST STATISTIC AND COMPARE IT TO THE CRITICAL VALUE TO DRAW YOU CONCLUSION. THE SAME RESULTS. YOU CAN USE SOFTWARE TO GENERATE A P-VALUE FOR COMPARISON VALUE ONLY NO CREDIT FOR JUST A SOFTWARE GENERATED P-VALUE.

80. At Rachels 11th birthday party, eight girls 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 girls thought that the mean difference between their jumping and relaxed times would be zero. Test their hypothesis.

Table 10.24

Relaxed time (seconds)	Jumping time (seconds)
26	21
47	40
30	28
22	21

Relaxed time (seconds)	Jumping time (seconds)
23	25
45	43
37	35
29	32