Chapter 4: Q.4.12 (page 189)
The symbol that is used for the linear correlation coefficient is -------
The symbol that is used for the linear correlation coefficient is .
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In Exercise 4.8, we give linear equations. For each equation,
a. find the -intercept and slope.
b. determine whether the line slopes upward, slopes downward, or is horizontal, without graphing the equation.
c. use two points to graph the equation.
Given equation is,
A measure of the total variation in the observed values of the response variable is the------.
The mathematical abbreviation for it is----.
Determine the linear correlation coefficient by formula and definition.
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.
In Problems 3-5, answer true or false to each statement. Explain your answers.
4. A horizontal line has no slope.
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