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Chapter 4: Q. 15 (page 192)
One use of the linear correlation coefficient is as a descriptive measure of the strength of the-------- relationsh岷 between two variables.
Linear
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PCBs and Pelicans. The data on shell thickness and concentration of PCBs for Anacapa pelican eggs from Exercise 4.76 are on the WeissStats site.
a. decide whether use of the linear correlation coefficient as a descriptive measure for the data is appropriate. If so, then also do parts (b) and (c).
b. obtain the linear correlation coefficient.
c. interpret the value of r in terms of the linear relationship between the two variables in question.
Determine the linear correlation coefficient by formula and definition.
Shortleaf Pines. The data from Exercise for volume, in cubic feet, and diameter at breast height, in inches, for shortleaf pines are on the Weiss Stats site.
a) Decide whether finding a regression line for the data is reasonable. If so, then also do puts .
8. Regarding the variables in a regression analysis.
a. what is the independent variable called?
b. what is the dependent variable called?
If y tends to decrease linearly as x increases. the variables are -------linearly correlated.
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