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Chapter 4: Q. 18 (page 192)
A value of close to -----suggests at most a weak linear relationship between the variables.
A value of close to localid="1651661900536" suggests at most a weak linear relationship between the variables.
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4.85 A measure of the amount of variation in the observed values of the response variable explained by the regression is the-----. The mathematical abbreviation for it is----.
If tends to increase linearly as increases, the variables are------ linearly correlated.
The data for shell thickness and concentration of PCBs for Anacapa pelican eggs from Exerciseare on the Weiss Stats site.
(a) Decide whether finding a regression line for the data is reasonable. If so, then also do puts .
4.76 PCBs and Pelicans, Polychlorinated biphenyls (PCBs), industrial pollutants, are known to be carcinogens and a great danger to natural ecosystems. As a result of several studies, PCB production was banned in the United States in and by the Stockholm Convention on Persistent Organic Pollutants in . One study, published in by R. Risebrough, is titled "Effects of Environmental Pollutants Upon Animals Other Than Man" (Proceedings of the 6th Berkeley Symposium on Mathematics and Statistics, Vl, University of California Press, Pp. ). In that study, Anacapa pelican eggs were collected and measured for their shell thickness, in millimeters (mm), and concentration of PCBs, in parts per million (ppm). The data are 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).
For each exercise, determine the linear correlation coefficient by using
a. Definirina on page ,
b. Formula on page .
Compare year annex an para (a) and (b
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