Chapter 3: Q.3.1 (page 176)
Find the residual for the subject who increased NEA by calories. Show your work
Short Answer
The residual plot for the subject is.
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Chapter 3: Q.3.1 (page 176)
Find the residual for the subject who increased NEA by calories. Show your work
The residual plot for the subject is.
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A school guidance counselor examines the number of extracurricular activities that students do and their grade point average. "The evidence suggests that the association between the number of extracurricular activities a kid participates in and his or her grade point average is close to zero," the guidance counsellor explains.鈥 A correct interpretation of this statement would be that
(a) active students tend to be students with poor grades, and vice versa.
(b) students with good grades tend to be students who are not involved in many extracurricular activities, and vice versa.
(c) students involved in many extracurricular activities are just as likely to get good grades as bad grades; the same is true for students involved in few extracurricular activities.
(d) there is no linear relationship between a number of activities and grade point average for students at this school.
(e) involvement in many extracurricular activities and good grades go hand in hand.
What affects correlation? Make a scatterplot of the following data:

The correlation for these data is . What is responsible for reducing the correlation to this value despite a strong straight-line relationship between and in most of the observations?
Outsourcing by airlines Airlines have increasingly outsourced the maintenance of their planes to other companies. Critics say that the maintenance may be less carefully done, so that outsourcing creates a safety hazard. As evidence, they point to government data on percent of major maintenance outsourced and 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.

(a) Describe the direction, form, and strength of the relationship between maintenance outsourcing and delays blamed on the airline.
(b) One airline is a high outlier in delay percent. Which airline is this? Aside from the outlier, does the plot show a roughly linear form? Is the relationship very strong?
To determine the least-squares regression line:

Marijuana and traffic accidents (1.1) Researchers in New Zealand interviewed drivers at age
They had data on traffic accidents and they asked the drivers about marijuana use. Here are data on the numbers of accidents caused by these drivers at age , broken down by marijuana use at the same age

(a) Make a graph that displays the accident rate for each class. Is there evidence of an association
between marijuana use and traffic accidents?
(b) Explain why we can鈥檛 conclude that marijuana use causes accidents.
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