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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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The linear correlation coefficient of a set of data points is .
a. Is the slope of the regression line positive or negative? Explain your answers.
b. Determine the coefficient of determination.
8. Regarding the variables in a regression analysis.
a. what is the independent variable called?
b. what is the dependent variable called?
More Money, More Beer?Does a higher state per capita income equate to a higher per capita beer consumption? From the document Survey of Current Business, published by the U.S. Bureau of Economic Analysis, and from the Brewer's Almanac, published by the Beer Institute, we obtained data on personal income per capita, in thousands of dollars, and per capita beer consumption, in gallons, for the states and Washington. D.C. Those data are provided on the Weiss Stats site.
a. Obtain a scatterplot for the data.
b. Decide whether finding a regression line for the data is reasonable. If so, then also do parts (c)-(f).
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,
The data for gas mileage and engine displacement for vehicles from Exercise are provided on the Weiss Stats site.
a) Decide whether finding a regression line for the data is reasonable. If so, then also do puts.
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