A researcher is investigating the impact of regular spinning classes on resting heart rate. She takes a random sample of 45 sedentary males, all of the same age, and exposes them to 3 spinning classes per week for 6 weeks. She then measures the sample mean and sample standard deviation for their resting heart rate. If the clinically accepted resting heart rate for sedentary males of this age is 72 bpm, the sample mean is 69 bpm and the sample standard deviation is 3.0, calculate the value of the appropriate statistic (i.e. thez

z-value or thet

t-value, whichever is appropriate) you would use in order to assess whether to accept or reject the null hypothesis that regular spinning classes make no difference to the heart rate