Chapter 4: Q. 1 (page 192)
For a linear equation, identify the
a. independent variable.
b. dependent variable.
c. slope.
d. intercept.
The answers for the subparts have been given below.
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11. Using a regression equation to make predictions for values of the predictor variable outside the range of the observed values of the predictor variable is called ________
A Knight-Ridder News Service article in an issue of the Wichita Eagle discussed a study on the relationship between country music and suicide. The results of the study. coauthored by S. Stack and J. Gundlach, appeared as the paper "The Effect of Country Music on Suicide" (Social Forces, Vol. 71, Issue 1. Pp. 211-218). According to the article, " analysis of 49 metropolitan areas shows that the greater the airtime devoted to country music. the greater the white suicide rate," (Suicide rates in the black population were found to be uncorrelated with the amount of country music airtime.)
(a). Use the terminology introduced in this section to describe the statement quoted above.
(b). One of the conclusions stated in the journal article was that country music "nurtures a suicidal mood" by dwelling on marital status and alienation from work. Is this conclusion warranted solely on the basis of the positive correlation found between airtime devoted to country music and white suicide rate? Explain your answer.
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).
12. In the context of regression analysis, what is an
a. outlier?
b. influential observation?
Wasp Mating Systems. In the paper "Mating System and Sex Allocation in the Gregarious Parasitoid Cotesia glomerata" (Animal Behaviour, Vol. , pp. ). H. Gu and S. Dorn reported on various aspects of the mating system and sex allocation strategy of the wasp C. glomerata, One part of the study involved the investigation of the percentage of male wasps dispersing before mating in relation to the brood sex ratio (proportion of males). The data obtained by the researchers are on the WeissStats site.
a. Obtain a scatterplot for the data.
b. Is it reasonable to find a regression line for the data? Explain your answer.
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