Chapter 4: Q. 4.129 (page 189)
To determine whether is positive, negative, or zero.
The will be negative
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Sample Covariance. For a set of n data points, the sample covariance, is given by
The sample covariance can be used as an alternative method for tinding the slope and y-intercept of a regression line. The formulas are
where denotes the sample standard deviation of the x-values.
a. Use Equation (4.1) to determine the sample covariance of the data points in Exercise 4,45.
b. Use Equation (4.2) and your answer from part (a) to find the regression equation. Compare your result to that found in Exercise 4.57.
A value of close to -----suggests at most a weak linear relationship between the variables.
Answer true or false to the following statement, and explain your answer: A strong correlation between two variables doesn't necessมilly mean that they"re causally related.
For regression analysis, and .
a. Obtain and interpret the coefficient of determination.
b. Determine SSE :
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.
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