The article “Validation of the Rockport Fitness Walking Test in College Males and Female...

The article “Validation of the Rockport Fitness Walking Test in College Males and Females” (Research Quarterly for Exercise and Sport, 1994: 152–158) recommended the following estimated regression equation for relating y = VO₂max (L/min, a measure of cardiorespiratory fitness) to the predictors

a. How would you interpret the estimated coefficient

b. How would you interpret the estimated coefficient

c. Suppose that an observation made on a male whose weight was 170 lb, walk time was 11 min, and heart rate was 140 beats/min resulted in VO₂max = 3.15. What would you have predicted for VO2max in this situation, and what is the value of the corresponding residual?

d. Using SSE = 30.1033 and SST = 102.3922, what proportion of observed variation in VO2max can be attributed to the model relationship?

e. Assuming a sample size of n = 20, carry out a test of hypotheses to decide whether the chosen model specifies a useful relationship between VO2max and at least one of the predictors.