According to Map 10.1, in which of the following regions of the country are you most likely to find a right-to-work state?

When researchers conduct survey studies via the internet,

a. they have to worry that respondents do not represent the population in general. b. there are newly established methods to guarantee the validity of the data. c. they can expect approximately equal participation by people at all socioeconomic levels. d. they have to question the validity of the data because teenagers access the internet more than adults do.

Suppose that your findings were as follows for the relationship between support for social welfare and income. Among whites, the significance level is .000 and Kendall’s tau = .40. Among African Americans, the significance level is .073 and Kendall’s tau = .034. Which of the following best describes the effects of the control variable?

A. The control variable has no effect. B. The control variable has a small effect, but the effect is not big enough to make any difference. C. The control variable has a substantial effect. D. Based just on this information, we cannot really determine whether the control variable has an effect on the relationship between the dependent variable and the independent variable.