A group of physical therapists want to study the effect of exercise routine on senior-citizen heart rate. Nine participants each wore a heart-rate monitor while performing two different exercise routines: a standard routine A and a new routine B. The data is given in the table. a) Compute a p-value for a two-tailed test that heart rate is not affected by routine. b) Compute a 95% confidence interval on the mean difference in heart rate. Subject A B 1 122 126 2 140 145 3 148 152 4 122 133 5 110 107 6 155 152 7 146 147 8 138 141 9 134 133

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