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Chapter 4: Q. 4.124 (page 189)
A value of close to indicates that the regression equation is either useless or ----- for making predictions.
Poor
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U.S. Presidents. The data from Exercise 4.71 for the ages at the inauguration and of death for the presidents of the United States 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 in terms of the linear relationship between the two variables in question.
For each exercise, determine the linear correlation coefficient by using
a. Definition 1.8 on page 183.
b. Formada 4.4 a pace 185.
Compare your answers in parts a) and (b).
12. In the context of regression analysis, what is an
a. outlier?
b. influential observation?
If there is no linear relationship between and , the variables are linear -------
The linear correlation coefficient is also known by another name. what is it?
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