Need help please

weight of the calf (in kilograms). You are the foreman of the Bar-S cattle ranch in Colorado. A neighboring ranch has calves for sale, and you are going to buy some calves to add to the Bar-S herd. How much should a healthy calf weigh? Let x be the age of the calf (in weeks), and let y be the y 39 16 100 26 36 200 Complete parts (a) through (e), given Ex = 95, Zy = 609, Ex2 = 2375, Zy2 = 81,559, Exy = 13,777, and r & 0.997. (a) Make a scatter diagram of the data. (Select the correct graph.) 200 y 150 200 50 100 150 100 50 30 100 50 00 OL O 10 20 50 30 X 40 10 20 30 X 40 10 20 30 40 OL O 10 20 30 40 Ex = (b) Verify the given sums Ex, Ey, Ex, Ey', Ex y, and the value of the sample correlation coefficient r. (For each answer, enter a number. Round your value for r to three decimal places.) Ey = [x2 = Ey2 = Exy = X = (c) Find x, and y. Then find the equation of the least-squares line y = a + b x. (For each answer, enter a number. Round your answers for x and y to two decimal places. Round your answers for a and b to three decimal places.) y = (d) Graph the least-squares line. Be sure to plot the point (x, y) as a point on the line. (Select the correct graph.) y 200 200 y 150 200 150 200 100 150 100 150 50 100 50 50- 20 50 30 40 -X O 10 20 30 20 30 40 -X 10 20 30 for 2 to three decimal places. Round your answers for the percentages to one decimal place.) (e) Find the value of the coefficient of determination 2. What percentage of the variation in y can be explained by the corresponding variation in x and the least-squares line? What percentage is unexplained? (For each answer, enter a number. Round your answ 12 = explained = unexplained = kg (f) The calves you want to buy are 11 weeks old. What does the least-squares line predict for a healthy weight (in kg)? (Enter a number. Round your answer to two decimal places.)