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In a regression analysis, if a new independent variable is added and R-squared increases and adjusted R-squared decreases precipitously, what can be concluded?
(a) The new independent variable improves the predictive power of the regression model.
(b) The new independent variable does not improve the predictive power of the regression model.
(c) The regression was performed incorrectly. It is impossible for R-squared to increase and adjusted R-squared decrease simultaneously.
(d) The new independent variable's coefficient is not significant at the 0.01 level.
For each of the following problems, assume that the homogeneity of variance assumption has not been met and that you will need to use the adjusted Welch statistic.
Select a US citizen and a citizen of China at random, independently of one another. Determine the probability that both have type O blood?
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Establish a 99% confidence interval for the difference in the proportion of suburban and urban housewives who own IPod.
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