The last seventeen amendments to the Constitution fall into three main categories: they make public policy, they correct deficiencies in the government's structure or they

There is frequently a trade-off between increasing either internal validity or external validity in an experiment. Which of the following may weaken internal validity while strengthening external validity?

a. conducting the experiment in the students' high school rather than a university laboratory b. testing all participants at 10:00 a.m. c. using a standardized set of instructions that are given by a tape recording d. testing all participants in the same room

It was Winston Churchill who declared that an iron curtain had descended across the continent of Europe

Indicate whether the statement is true or false