When a confound is found within an experiment, the external validity of the experiment is challenged.

You are interested in studying a group of people who make up just a small fraction of the population but that are theoretically interesting. Which type of probability sample would BEST allow you to sample them?

Which type of hypothesis represents a statement of equality?

An experiment that is highly controlled is said to have

One advantage of cluster sampling is

The operational definition refers to how you assess the validity of a variable.

After he had finished his qualitative data analysis, Dr. Yorgason took it back to his participants to see if he had adequately reflected what they had said. This is an example of debriefing.

Dr. Frank N. Stein developed an aggression measure and had his students fill out the measure and an already existing measure of aggression. He found that students’ scores on the two measures were moderately correlated. This is an example of

A young researcher is interested in whether seniors spend more time than freshman studying in the library. Having obtained the percent of students who are freshman and seniors from the administration, the researcher proceeds to ask seniors and freshman how much time they spend in the library, making sure the sample matches the correct % for freshman and seniors, respectively. The researcher has used

Participants were not allowed to withdraw from the study.