An exercise physiologist classifies people – on the basis of their body mass index, heart rate, and lung capacity – as (a) above average in terms of fitness or (b) below average in terms of their fitness. He then directs the same people to walk on a treadmill, individually, at an increasing speed until they can no longer walk. He records the speed of the treadmill when a person maxes out on walking. He wants to know if there is a difference in the maximum walking speed for patients who have undergone knee replacement in the last ten years based on fitness level. A total of 100 people participated in the study.
- What is the population and sample?
- What are the dependent and independent variables?
- What is the research hypothesis?
- What are the levels of measurement for the dependent and independent variables?
