9. The regression line below gives the relationship between quiz grades and test grades. TG = 40.448 + 5.175QG
where TG = test grade and QG = quiz grade. The linear correlation coefficient r = 0.63830. The test mean was 68 and the quiz grades range between 3 and10. The objective of the regression analysis was to determine if test grades reflect quiz grades.
a). What are the predictor and response variables?
predictor: QG
response: TG
b). Estimate the test grade of a student who scored 6 on the quiz. If the estimate is not possible, explain why not.
71.468
c). Estimate the test grade of a student if the quiz grade was 12. If the estimate is not possible, explain why not.
it is not possible because the highest quiz grade is a 10.
d). Estimate the quiz grade of a student who had 70 on the test. If the estimate is not possible, explain why not.
5.71
1 answer