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Chapter 4: Q. 4.2 (page 160)
Fill in the blank.
The graph of a linear equation with one independent variable is a _____.
The graph of a linear equation with one independent variable is a straight line.
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For which of the following sets of data points can you reasonably determine a regression line? Explain your answer.
Determine the linear correlation coefficient by formula and definition.
The data from Exercise for age and percentage of body fat for 18 randomly selected adults are on the Weiss Stats site.
a. Decide whether use of the linear correlation coefficient as a descriptive measure for the data is appropriate, If so, then also parts and
b. Obtain the linear correlation coefficient.
c. Interpret the value of in terms of the linear relationship between the two variables in question.
Fill in the blanks.
a. In the context of regression, an_______ is a data point that lies far from the regression line, relative to the other data points.
b. In regression analysis, an_______ is a data point where removal causes the regression equation to change considerably:
More Money, More Beer? The data for per capita income and per capita beer consumption for the states and Washington, D.C., from Exercise 4.77 are on the WeissStats site.
a. decide whether the 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 mo variables in question.
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