f Messenger | Facebook X D D2L Exam 1 Practice Test S X D2L Exam 1 Practice Test S X "A HW 4 - Math 270.02 - X Losing 15k networth t X D2L Chapter Four Lecture X *Course Hero X X webassign.net/web/Student/Assignment-Responses/last?dep=28421681 G ABP 12. [-/16 Points] DETAILS BBBASICSTAT8 4.2.011.S. MY NOTES PRACTICE ANOTHER Let x be the age in years of a licensed automobile driver. Let y be the percentage of all fatal accidents (for a given age) due to speeding. For example, the first data pair indicates that 34% of all fatal accidents of 17-year-olds are due to speeding. X 17 27 37 47 57 67 24 21 12 10 LO USE SALT Complete parts (a) through (e), given Ex = 329, Zy = 113, Ex2 = 18,263, Zy2 = 2491, Exy = 3991, and /~ -0.9660. (a) Draw a scatter diagram displaying the data. 35 35 30 30 25 25 due to speeding) due to speeding) y (percentage of all fatal accidents 20 y (percentage of all fatal accidents 20 15 15 10 10 20 30 40 50 60 70 20 30 40 50 60 70 O x (age (in years)) O x (age (in years)) 30 80 70 70 1 fatal accidents 1 fatal accidents 60 50 eeding) eeding) Type here to search O Pr Ps N EN 7:20 PM 810F ~ 41)2/15/2022f Messenger | Facebook X D2L Exam 1 Practice Test S X D2L Exam 1 Practice Test S X " HW 4 - Math 270.02 - X Losing 15k networth t X D2L Chapter Four Lecture X Course Hero X X -> C webassign.net/web/Student/Assignment-Responses/last?dep=28421681 G ABP ES 25 25 due to speeding 20 due to speeding) 20 y (percentage of all fatal acc y (percentage of all fatal acc 15 15 10 10 5 20 30 40 50 60 70 20 30 40 50 60 70 O x (age (in years)) O x (age (in years)) 80 70 70 60 60 50 50 due to speeding y (percentage of all fatal accidents y (percentage of all fatal accidents due to speeding) 10 40 30 30 20 20 5 10 15 20 25 30 5 10 15 20 25 30 O x (age (in years)) O x (age (in years)) (b) Verify the given sums Ex, Ey, Ex2, Ey2, Exy and the value of the sample correlation coefficient r. (Round your value for / to four decimal places.) Ex = Ey = Type here to search O Pr Ps La N EN 7:20 PM 810F ~ 41) 812/15/2022f Messenger | Facebook X D2L Exam 1 Practice Test S X D2L Exam 1 Practice Test S X "A HW 4 - Math 270.02 - X Losing 15k networth t X D2L Chapter Four Lecture X *Course Hero X X C webassign.net/web/Student/Assignment-Responses/last?dep=28421681 G ABP ES 70 70 60 60 50 50 due to speeding) due to speeding) y (percentage of all fatal accide y (percentage of all fatal accid 10 40 30 30 20 20 5 10 15 20 25 30 5 10 15 20 25 30 O x (age (in years)) O x (age (in years)) (b) Verify the given sums Ex, Ey, Ex2, Zy2, Exy and the value of the sample correlation coefficient r. (Round your value for r to four decimal places.) EX = Ey = [x2 = Ey2 = Exy = (c) Find x, and y. Then find the equation of the least-squares line y = a + bx. (Round your answer to four decimal places.) * = V = (d) Graph the least-squares line. Be sure to plot the point (x, y) as a point on the line. 35 35 I accidents | accidents 30 30 br Type here to search O Pr Ps Za 9 G N EN 7:20 PM 810F ~ 41) 912/15/2022f Messenger | Facebook X D2L Exam 1 Practice Test S X D2L Exam 1 Practice Test S X 2 HW 4 - Math 270.02 - X Losing 15k networth t X D2L Chapter Four Lecture X *Course Hero X X > C webassign.net/web/Student/Assignment-Responses/last?dep=28421681 G ABP ES (d) Graph the least-squares line. Be sure to plot the point (x, y) as a point on the line. 35 35 30 30 25 25 due to speeding) y (percentage of all fatal accidents 20 due to speeding) y (percentage of all fatal accidents 20 15 15 10 10/ 5 20 30 40 50 60 70 20 30 40 50 60 70 O x (age (in years)) O x (age (in years)) 80 80 70 70 60 60 due to speeding) y (percentage of all fatal accidents 50 due to speeding) y (percentage of all fatal accidents 40 40 30 30 20 20 5 10 15 20 25 30 5 10 15 20 25 30 O x (age (in years)) O x (age (in years)) Type here to search O m Pr Ps Za N EN 7:21 PM 810F ~ 41) 812/15/2022f Messenger | Facebook X D2L Exam 1 Practice Test S X D2L Exam 1 Practice Test S X "A HW 4 - Math 270.02 - X Losing 15k networth t X D2L Chapter Four Lecture X *Course Hero X X -> C webassign.net/web/Student/Assignment-Responses/last?dep=28421681 G ABP ES x (age (in years)) O x (age (in years)) 80 80 70 70 60 60 50 y (percentage of all fatal accidents due to speeding) due to speeding) y (percentage of all fatal accidents 40 40 30 30 20 20 5 10 15 20 25 30 5 10 15 20 25 30 O x (age (in years)) O x (age (in years)) (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? (Round your answer for / to four decimal places. Round your answers for the percentages to two decimal place.) 12 = explained % unexplained % (f) Predict the percentage of all fatal accidents due to speeding for 40-year-olds. (Round your answer to two decimal places.) % Need Help? Read It Type here to search O Pr PS N EN 7:21 PM 810F ~ (1 )) 9 1 2/15 /2022