You want to conduct a study to determine whether wedding proposals tend occur more frequently during storm-related power outages. What kind of study would you be conducting?

If statistical analyses show that the difference between condition means is no 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

The arguments by scientists who believe that racial categories are natural, not social, categories include the idea that

a. the genetic difference between races is over 10% across all races. b. there was a sufficient length of time for the different races to become geographically separated and to become genetically different. c. the recent Human Genome Project has identified distinctly different genes that do not overlap across racial groups. d. differences in average brain sizes across racial groups match differences in measurements of intelligence.