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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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In the article "Comparison of Fiber Counting by TV Screen and Eyepieces of Phase Contrast Microscopy" (Amer. icon Industrial Hyeiene Asseciution Journal, Vol. 63, Pp. 756-761), 1. Moa et al. reported on determining fiber density by two different methods. Twenty samples of varying fiber density were each counted by 10 viewers by means of an eyepiece method and a television screen method to determine the relationship between the counts done by each method. The results, in fibers per square millimeter, are presented on the Weiss Stats 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.
Shortleaf Pines. The data from Exercise for volume, in cubic feet, and diameter at breast height, in inches, for shortleaf pines are on the Weiss Stats site.
a) Decide whether finding a regression line for the data is reasonable. If so, then also do puts .
More Money, More Beer? The data for per capita income and per capita beer consumption for the states and Washington, D.C. from Exercise are on the Weiss Stats site.
(a) Decide whether finding a regression line for the data is reasonable. If so, then also do parts.
Top Wealth Managers. An issue of HAKRON'S presented information on top wealth managers in the United States bused on individual clients with accounts of million er more. Data were given for various variables, two of which were a number of private client managers and private client assets. Those data are provided on the WeissStats site, where private client assets are in ballons of dollars.
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).
U.S. Presidents. The data from Exercise 4.71 for the ages at the inauguration and of death for the presidents of the United States are on the Weissstats site.
a. decide whether 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 two variables in question.
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