Introduction To Statistics And Data Analysis
6th Edition
ISBN: 9781337793612
Author: PECK, Roxy.
Publisher: Cengage Learning,
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Textbook Question
Chapter 5.1, Problem 11E
The paper “The Relationship Between Cell Phone Use, Academic Performance, Anxiety, and Satisfaction with Life in College Students” (Computers in Human Behavior [2014]: 343-350) described a study of cell phone use among undergraduate college students at a public university. The paper reported that the value of the
- a. Interpret the given value of the correlation coefficient. Does the value of the correlation coefficient suggest that students who use a cell phone for more hours per day tend to have higher GPAs or lower GPAs?
- b. The study also investigated the correlation between texting (measured as the total number of texts sent and texts received per day) and GPA. The direction of the relationship between texting and GPA was the same as the direction of the relationship between cell phone use and GPA, but the relationship between texting and GPA was not as strong. Which of the following possible values for the correlation coefficient between texting and GPA could have been the one observed?
- c. The paper included the following statement: “Participants filled in two blanks-one for texts sent and one for texts received. These two texting items were nearly perfectly correlated.” Do you think that the value of the correlation coefficient for texts sent and texts received was close to −1, close to 0, or close to +1? Explain your reasoning.
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(a) Compute a 90% CI for the true correlation coefficient ?. (Round your answers to four decimal places.)
,
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z
=
P-value
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Chapter 5 Solutions
Introduction To Statistics And Data Analysis
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