Nine subjects were used in an experiment to determine if an atmosphere involving exposure to carbon monoxide has an impact on breathing capability. The data were collected by personnel in the Health and Physical Education Department at Virginia Polytechnic Institute and State University. The data were analyzed in the Statistics Consulting Center at Hokie Land. The subjects were exposed to breathing chambers, one of which contained a high concentration of CO. Several breathing measures were made for each subject for each chamber. The: subjects were exposed to the breathing 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 environments. Use a = 0.05. Assume that breathing frequency is approximatelynormal.

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Subject With Co Without CO 30 30 40 45 25 26 25 34 4 23 30 19 51 16 :V2 41 35 30 28