9. Bruce et al. (1973; American Heart Journal 65, 546-562) investigated the physical conditioning of 51 sedentary male subjects. For each subject, the duration (in seconds) over which the subject could run on a treadmill and the maximum oxygen uptake (VO2Max) was measured. The following shows the results of a simple regression, predicting VO2Max from duration: . regress vo2max duration Source SS df MS Number of obs = 51 F( 1, 49) 232 . 15 Model 2451 . 7758 2451 . 7758 Prob > F 0 . 0000 Residual 517 . 496044 19 10 . 5611438 R-squared 0. 8257 Adj R-squared = 0 . 8222 Total 2969. 27184 59. 3854369 Root MSE 3. 2498 702max Coef. Std. Err. t [958 Conf. Interval] duration 0539263 0035393 15 . 24 0. 000 0468139 0610388 _cons 4. 767066 2. 200903 2. 17 0 . 035 . 344187 9 . 189946 (a) (5pts) Present the fitted regression line. (b) (6pts) What can you conclude from the results of the regression? (c) (5pts) What proportion of the variation in VO2Max is explained by duration? (d) (5pts) What is the predicted VO2Max when duration is 600 seconds? (e) (5pts) If the duration is recorded in minutes, what will the intercept and the slope be