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Chapter 3: Q.3.3 (page 176)
For which subject did the regression line overpredict fat gain by the most? Justify your answer.
The residual is negative ()it could be said that for the point the fat gain has been over predicted
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The National Student Loan Survey provides data on the amount of debt for recent college graduates, their current income, and how stressed they feel about college debt. A sociologist looks at the data with the goal of using the amount of debt and income to explain the stress caused by college debt.
Measurements on young children in Mumbai, India, found this least-squares line for predicting height from the arm span Measurements are in centimeters (cm).
According to the regression line, the predicted height of a child with an arm span of 100 cm is about
Teaching and research A college newspaper interviews a psychologist about student ratings of the teaching of faculty members. The psychologist says, “The evidence indicates that the correlation between the research productivity and teaching rating of faculty members is close to zero.” The paper reports this as “Professor McDaniel said that good researchers tend to be poor teachers, and vice versa.” Explain why the paper’s report is wrong. Write a statement in plain language (don’t use the word “correlation”) to explain the psychologist’s meaning.
If women always married men who were years older than themselves, what would the correlation between the ages of husband and wife be?
(a) (c) (e) Can’t tell without
(b) (d) seeing the data
Airlines have increasingly outsourced the maintenance of their planes to other companies. Critics say that the maintenance may be less carefully done so outsourcing creates a safety hazard. As evidence, they point to government data on the percent of major maintenance outsourced and the percent of flight delays blamed on the airline (often due to maintenance problems): Make a scatterplot by hand that shows how delays relate to outsourcing.
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