Game performance of water polo players. The journal Biology of Sport (Vol. 31, 2014) published a study of the physiological performance of top-level water polo players.

Eight Olympic male water polo players participated in the study. Two variables were measured for each during competition: y = mean heart rate over the four quarters of the game (expressed as a percentage of maximum heart rate) and x = maximal oxygen uptake (VO2max). The data (simulated, based on information provided in the article)

are shown in the accompanying table. The researchers conducted a simple linear regression analysis of the data.

A MINITAB printout of the analysis follows.

a. Give the equation of the least squares line.

b. Give a practical interpretation (if possible) of the y-intercept of the line.

c. Give a practical interpretation (if possible) of the slope of the line.

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Player HR% VOMax 12345678 55 148 54 157 70 160 67 179 74 179 77 180 78 194 85 197