Bundle: Introduction to Statistics and Data Analysis, 5th + WebAssign Printed Access Card: Peck/Olsen/Devore. 5th Edition, Single-Term
5th Edition
ISBN: 9781305620711
Author: Roxy Peck, Chris Olsen, Jay L. Devore
Publisher: Cengage Learning
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Textbook Question
Chapter 5, Problem 57CR
The following data on x = Score on a measure of test anxiety and y = Exam score for a sample of n = 9 students are consistent with summary quantities given in the paper “Effects of Humor on Test Anxiety and Performance” (Psychological Reports [1999]: 1203–1212):
Higher values for x indicate higher levels of anxiety.
- a. Construct a
scatterplot , and comment on the features of the plot. - b. Does there appear to be a linear relationship between the two variables? How would you characterize the relationship?
- c. Calculate the value of the
correlation coefficient . Is the value of r consistent with your answer to Part (b)? - d. Is it reasonable to conclude that test anxiety caused poor exam performance? Explain.
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The accompanying data were read from a plot (and are a subset of the complete data set) given in an article. The data represent the mean response times for a group of individuals with closed-head
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Chapter 5 Solutions
Bundle: Introduction to Statistics and Data Analysis, 5th + WebAssign Printed Access Card: Peck/Olsen/Devore. 5th Edition, Single-Term
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