A study involves a 3 × 4 × 2 factorial design. How many independent variables are being studied?

Raymond has designed a study to examine sexual arousal among male and female college students to erotic or nonerotic movies. A simple main effect of the type of movie would analyze whether arousal level is different for

Matt, a researcher, employs a confederate to drop a stack of papers in front of a person and a group of people. He then measures the amount of time it takes for the confederate to receive help in picking up the papers. This scenario best exemplifies a________ manipulation.

Promelute Inc., a pharmaceutical company, conducts a study for its new drug for the treatment of obsessive-compulsive disorder. The researcher is unclear about the results of the study because he is not sure if the improvement observed resulted from the properties of the drug or from the participants’ expectations about the effect of the drug. Such an effect is known as a(n)________ effect.

An interaction occurs whenever

To study personality development, a researcher studies the same individuals at 11, 14, 21, and 30 years of age. In this case, the researcher is using the________ method.

A way to improve the interrupted time series design is to use a________ design.

A researcher designs a study in which participants are randomly assigned to one of two conditions. Each participant is then measured under two different circumstances. This is an example of a(n)________ design.

In the context of reversal designs, the ABAB design

A researcher who measures the speed of helping in response to a request is using a________ measure.