Twenty-two Olympic male water polo players participated in a study on the physiological performance of top-level water polo players. Two variables were measured for each participant during the competition: the mean heart rate (HR) over the four quarters of the game (expressed as a percentage of maximum heart rate) and the maximal oxygen uptake (VO2max) in ml/kg/min. Assume all necessary conditions are met. Select R output for the researchers' model is given below. Call: lm(formula = VO2Max HR, data = polo) Coefficients: (Intercept) HR Estimate Std. Error t value Pr(>|t|) 81.7859 1.2560 11.3112 0.1645 7.230 5.36e-07 7.635 2.38e-07 Residual standard error: 7.111 on 20 degrees of freedom Multiple R-squared: 0.7445, Adjusted R-squared: 0.7318 F-statistic: 58.29 on 1 and 20 DF, p-value: 2.382e-07 (a) What is the response variable in this analysis? (b) State the least squares regression line. (c) Calculate a 95% confidence interval for the slope term. Use t = 2.086