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.
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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Get started for freeAll brawn? The figure below plots the average brain weight in grams versus average body weight in kilograms for species of mammals. There are many small mammals whose points at the lower-left overlap.
(a) The correlation between body weight and brain weight is. Explain what this value means.
(b) What effect would removing the elephant have on the correlation? Justify your answer.
The graph at the top right plots the gas mileage (miles per gallon) of various cars from the same model year versus the weight of these cars in thousands of pounds. The points marked with red dots correspond to cars made in Japan. From this plot, we may conclude that
(a) there is a positive association between weight and gas mileage for Japanese cars.
(b) the correlation between weight and gas mileage for all the cars is close to .
(c) there is little difference between Japanese cars and cars made in other countries.
(d) Japanese cars tend to be lighter in weight than other cars.
(e) Japanese cars tend to get worse gas mileage than other cars.
Beavers and beetles Do beavers benefit beetles? Researchers laid out circular plots, each meters in diameter, in an area where beavers were cutting down cottonwood trees. In each plot, they counted the number of stumps from trees cut by beavers and the number of clusters of beetle larvae. Ecologists think that the new sprouts from stumps are more tender than other cottonwood growth, so beetles prefer them. If so, more stumps should produce more beetle larvae. Here are the data:
The scatterplots below show four sets of real data:
(a) repeats the manatee plot in Figures
(b) shows the number of named tropical storms and the number predicted before the start of hurricane season each year between and by William Gray of Colorado State University;
(c) plots the healing rate in micrometers (millionths of a meter) per hour for the two front limbs of several newts in an experiment; and
(d) shows stock market performance in consecutive years over a -year period.
For each graph, estimate the correlation r. Then interpret the value of r in context.
(a)
(b)
(c)
(d)
Oil and residuals Refer to Exercise . The following figure shows a residual plot for the least-squares regression line. Discuss what the residual plot tells
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