Question: A physician claims that joggers' maximal volume oxygen uptake is greater than the average of all adults. A sample of 15 joggers has a mean of 43.6 milliliters per kilogram (ml/kg) and a standard deviation of 6 ml/kg. If the average of all adults is 36.7 ml/kg, is there enough evidence to support the physician's claim at = 0.05?

First, identify the alternative and the null hypotheses.

Second, calculate the critical value and d.f.

Next, use the appropriate formula.

Finally, decide whether or not to reject the null hypothesis.