The best definition of an experiment is a. a standardized scientific procedure for conducting investigations b. the identical treatment of participants in two groups to determine the effect of a dependent variable on an independent variable c. a systematic recording of behavior exhibited by participants in the laboratory d. a carefully controlled scientific procedure that determines whether variables manipulated by the experimenter have a causal effect on other variables

Which perminant civil rights leader would have disagreed most with washington's approach to solving the problem of racial inequality in the south?

Which factors are examples of how technology may have affected the great migration apex

It is widely assumed that people need to engage in intellectual activities such as solving crossword puzzles or mathematics problems in order to maintain mental sharpness as they age. in fact, however, simply talking to other people—that is, participating in social interaction, which engages many mental and perceptual skills—suffices. evidence to this effect comes from a study showing that the more social contact people report, the better their mental skills. which of the following, if true, most seriously weakens the force of the evidence cited? (a) as people grow older, they are often advised to keep exercising their physical and mental capacities in order to maintain or improve them. (b) many medical conditions and treatments that adversely affect a person's mental sharpness also tend to increase that person's social isolation. (c) many people are proficient both in social interactions and in solving mathematical problems. (d) the study did not itself collect data but analyzed data bearing on the issue from prior studies. (e) the tasks evaluating mental sharpness for which data were compiled by the study were more akin to mathematics problems than to conversation.