A health researcher wants to be able to predict maximal aerobic capacity (VO2max), an indicator of fitness and health. Normally, to perform this procedure requires expensive laboratory equipment and necessitates that an individual exercise to their maximum (i.e., until they can no longer continue exercising due to physical exhaustion). This can put all of those individuals that are not very active/fit and those individuals that might be at higher risk of ill health (e.g., older unfit subjects). For these reasons, it has been desirable to find a way of predicting an individuals VO2max based on more easily and cheaply measured attributes. To this end, the researcher recruits 100 participants to perform a maximum V02max test, and records various variables that might effect VO2max. He then runs a multiple regression in order to predict VO2max.

Answer the following four questions related to the data.

a. How many independent variables were used in the analysis? What were they?

b. Describe if the model was a good fit and why or why not?

c. Which of the variables were the most predictive of VO2max?