stat 111 summer 2008

stat 111 summer 2008 - Sample Midterm Questions Stat111...

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1 Sample Midterm Questions Stat111 – Summer 2008 NOTE: This sample midterm is shorter than the actual midterm will be. Question 1 Do IQ scores of Self-concept affect GPA? Based on 102 eighth-grade students in a rural Midwestern school with their IQ score, Self-concept scores and GPA we have the following information. r = 0.542 for the regression of GPA on Self-concept r = 0.632 for the regression of GPA on IQ N Mean STD Dev GPA 102 8.3 3.5 SELF-CONCEPT 102 52.3 13.4 (a) Suppose that we are interested in predicting GPA by Self-concept scores. Calculate the best-fit line for Y = GPA and X = Self-concept scores. (b) Julia’s Self-concept score is 31. Predict her GPA using the best-fit line.
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2 (c) If an eighth-grade student decreases his Self-concept score by 12, what change do you expect in his GPA? (d) Which variable, Self-concept or IQ has a stronger association with GPA and how do you know this? Question 2 A population of students contains 32% freshmen, 50% sophomores and 18% juniors.
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