Exam 9: Controls and Threats to Interval Validity

A single blind study is preferred over a double blind study.

In a ___________ study, neither the participant nor the researcher knows which group a particular participants has been assigned.

In the Are You Equipped Now at the end of the chapter, the authors of the textbook identified ______ threats to internal validity?

You have just learned of survey results conducted by your university on the drinking behaviors of the college campus.Wondering about the results, you ask yourself the following questions: how were participants selected, were participants selected depending on if they lived on- or off-campus, were all the participants in a sorority or fraternity, were non-traditional age students included in the survey, and were men and women equally sampled? These types of questions indicate that you are concerned about what threat to internal validity?

Regression to the mean involves groups of participants communicating with one another.

Regression to the mean is a mathematical equation for interpreting threats to external validity.

Research should be designed to _________ for nuisance and extraneous variables.

While researchers can reduce placebo effects through double-blind procedures, researchers cannot reduce instrumentation effects.

Testing is a threat to internal validity in which participants systematically dropping out of an experiment.

When a change in the dependent variable could be due to internal changes within the participant that occurred over time, __________ is a threat to internal validity.

Which of the following is an accurate statement regarding the similarities between extraneous and nuisance variables?

History is an event beyond the researcher's control.

If you and a friend watched an episode of Family Guy separately and counted the number of violent acts, you are likely to get different counts.Which threat to internal validity explains these results?

Reflect on the Are You Equipped Now at the end of the chapter.If the change in the dependent variable was due to participants selecting the joint that caused the most pain, which of the following was a threat to internal validity?

Reflect on the Are You Equipped Now at the end of the chapter.The article indicated that about 11% of the participants had already received acupuncture in the year before the treatment.This fact is associated with which of the following threats to internal validity?

Think of a research experiment designed to test which diet is best at helping people lose weight-Atkins, Jenny Craig, or Weight Watchers.The results could show that the average weight lost on Atkins was 6 pounds per week and on Jenny Craig and Weight Watchers was 2 pounds per week.It is important to ask yourself if participants are dropping out of a study in a manner that might influence the results to determine if __________ is a threat to internal validity.

Selection of participants is not a threat to internal validity.

Which of the following threats to internal validity would be of concern if an outbreak of salmonella in peanut butter occurred while a study was being conducted on perceptions of peanut butter?

When a change in the dependent variable could be due to changes in how the dependent variable was measured, _________ is a threat to internal validity.

The textbook authors conducted two studies on social networking sites.The first study was conducted in the spring semester on college freshmen and the second study was conducted in the fall semester on college freshmen.The authors found that __________ was a nuisance variable.