10.54 Nine subjects were used in an experiment to determine if exposure to carbon monoxide has an im- pact on breathing capability. The data were collected by personnel in the Health and Physical Education De- partment at Virginia Tech and were analyzed in the Statistics Consulting Center at Hokie Land. The sub- jects were exposed to breathing chambers, one of which contained a high concentration of CO. Breathing fre- quency measures were made for each subject for each chamber. The subjects were exposed to the breath ing chambers in random sequence. The data give the breathing frequency, in number of breaths taken per minute. Make a one-sided test of the hypothesis that mean breathing frequency is the same for the two en- vironments. Use a = 0.05. Assume that breathing frequency is approximately normal. Subject With CO Without CO 1 30 3O 2 45 40 3 26 25 4 25 23 5 34 30 6 51 49 7 46 41 8 32 35 9 30 28