In order to keep response rates high, researchers decide to first collect data by mailing surveys to potential respondents, after which they will begin calling respondents on the telephone. This method is known as ______.

If statistical analyses show that the difference between condition means is larger than would be expected on the basis of error variance alone, a researcher will

a. accept the null hypothesis b. reject the null hypothesis c. fail to reject the null hypothesis d. reject the experimental hypothesis e. both a and d

Which of the following groups is not tax-exempt?

a. Foundations b. Political action committees c. Section 501(c)(4) groups d. Sections 527 groups e. Think tanks