6. Suppose a researcher used data on a group of third year students at MIT to estimate the following regression (standard errors are in the parenthesis), where termGPA is GPA for a term, and atndrte is percentage points of classes attended during the term termGPA= 0.625+0.024atndrte (0.115) (0.001) 1) If the sample mean atndrte is 82, what is the sample mean of termGPA? 2) If student A has atndrte= 84 and student B has atndrte= 68, what is the predicted difference in their termGPA? A's actual termGPA is 3.2, and B's termGPA is 2.7. Why the predicted difference is not the same as the actual difference? 3) If the sample standard deviation of atndrte is 18 and the sample standard deviation of termGPA is 0.74, what is the sample correlation between atndrte and termGPA?
6. Suppose a researcher used data on a group of third year students at MIT to estimate the following regression (standard errors are in the parenthesis), where termGPA is GPA for a term, and atndrte is percentage points of classes attended during the term termGPA= 0.625+0.024atndrte (0.115) (0.001) 1) If the sample mean atndrte is 82, what is the sample mean of termGPA? 2) If student A has atndrte= 84 and student B has atndrte= 68, what is the predicted difference in their termGPA? A's actual termGPA is 3.2, and B's termGPA is 2.7. Why the predicted difference is not the same as the actual difference? 3) If the sample standard deviation of atndrte is 18 and the sample standard deviation of termGPA is 0.74, what is the sample correlation between atndrte and termGPA?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 26PFA
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