Consider the following situation to answer questions 8 At 9. In a math class the

Question

Consider the following situation to answer questions 8 At 9. In a math class the teacher asked the students to indicate the number of assigned exercises they did before the exam. Then compared with the percentages they got on the test. If "x" represents the number of exercises done before the exam and "y" is the percentage obtained, then the results are as shown in the table: X 9 3014 45 2125 30 28 37 34 Y- 95 80 88 77 90 92 83 85 7678 8. The value of the linear correlation coefficient between the variables is A. -0.99 B. -0.55 C. -0.88 D. 0.78 9. The linear regression equation (or the best fit line) that describes the relationship between the variables is: A. Y -99.47x 0.55 B. Y -0.55x 99.47 C. Y -0.88x 99.47 D. Y- 99.47x 0.88

Explanation / Answer

8. part c -0.88

9. part B y= -0.55+99.47x

6. part b

7. part b

22. 0.89 part a

23. part c 0.9222

24. this mean 62% approved of couse

z value at 0.64

z=x-u/sd

0.305=70-u/8

u=67.50

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