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Chapter 4: Q.4.118 (page 189)
What is one purpose of the linear correlation coefficient?
The linear correlation coefficient is used to determine the magnitude and direction of a linear link between two variables.
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A positive linear relationship between two variables means that one variable tends to increase linearly as the other------
8. Regarding the variables in a regression analysis.
a. what is the independent variable called?
b. what is the dependent variable called?
Theintercept of a line has no effect on the steepness of the line.
Shortleaf Mines. The ability to estimate the volume of a tree based on a simple measurement, such as the tree's diameter, is important to the lumber industry, ecologists, and conservationists. Data on volume, in cubic feet. and diameter at breast height, in inches, for shortlist pics were reported in C. Bruce and F. X. Schumacher's hopes Mensuration (New York: McGraw-Hill. ) and analyzed by A. C. Atkinson in the article "Transforming Both Sides of a Tree" (The Anarricas Slasisiciun, Vol, 48, PD. ), The data are presented on the WeissStats site.
a. Obtain a scatterplot for the dater.
h. Decide whether finding a depression lime for the data is reasonable. If so, then also do jurras (e) (f.
12. In the context of regression analysis, what is an
a. outlier?
b. influential observation?
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