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Chapter 4: Q. 4.128 (page 189)
To determine whether r is positive, negative, or zero.
The is Zero
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For a data set consisting of two data points:
a. identify the regression line.
b. What is the sum of squared errors for the regression line? Explain your answer.
If tends to increase linearly as increases, the variables are------ linearly correlated.
In Exercise 4.10, 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.
Estriol Level and Birth Weight. The data for estriol levels of pregnant women and birth weights of their children from Exercise are on the Weiss tats 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 ofin terms of the linear relationship between the two variables in question.
Acreage and Value. The data from Exercise 4.73 for lot size (in acres) and assessed value (in thousands of dollars) for a sample of homes in a particular area are on the WeissStats site.
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