y \\a 50 45 O 40 I. . I 35 I I I 30 25- 20...|...i...|...i...|.x ...i...|...i...1...i.x 00 2 4 6 8 10 2 4 6 8 10 (c) Find the sample correlation coefficient r and the coefficient of determination. (Round your answers to three decimal places.) What percentage of variation in y is explained by the least-squares model? (Round your answer to one decimal place.) 0/0 d) If someone had x = 5 job changes, what does the leastsquares line predict for y, the annual salary? (Round your answer to two decimal places.) thousand dollars Modern medical practice tells us not to encourage babies to become too fat. Is there a positive correlation between the weight X of a 1-year old baby and the weight y of the mature adult (30 years old)? A random sample of medical files produced the following information for 14 females. X(Ib) 20 26 22 22 20 15 25 21 17 24 26 22 18 19 y(lb) 121 120 118 124 130 120 145 130 130 130 130 140 110 115 IA USE SA T 2x = 297; Zy = 1,763; 2x2 = 6,445; :y2 = 223,191; ny = 37,574 (a) Find 2 )7, b, and the equation of the least-squares line. (Round your answers for ; and yto two decimal places. Round your answers for least-squares estimates to three decimal places.) X: O'KI ..x m (b) Draw a scatter diagram for the data. Plot the least-squares line on your scatter diagram. y y 160 '