Exam 10: Experimental Research

Exhibit 10-12: A researcher investigated the effect of aerobic exercise on depression.He randomly assigned subjects previously identified as depressed to one of three groups.Choose the correct group for each question. -Refer to Exhibit 10-12.Which is the true control group?

The term "control" in research generally refers to controlling

The most powerful control technique, given the number of influences potentially controlled, is

Exhibit 10.1: A third grade teacher feels that vocabulary instruction will help her children improve their reading scores.Half of her class receives vocabulary instruction, while the other half has a library period.She will compare reading scores after four months. -Refer to Exhibit 10-1.In order to test her hypothesis the teacher should have which group receive vocabulary instruction?

The fact that young children's articulation problems often disappear by themselves over time indicates why researchers must use ____in order to have internal validity.

Exhibit 10.1: A third grade teacher feels that vocabulary instruction will help her children improve their reading scores.Half of her class receives vocabulary instruction, while the other half has a library period.She will compare reading scores after four months. -Refer to Exhibit 10-1.The external validity question in this study would be:

List five threats to the internal validity of an experimental design.

The experimenter effect as an internal validity threat is concerned most directly with

If a researcher wishes to generalize the results of a study to a specifically defined population, he/she should arrange a research study in which

The term "randomization" refers to

Which of the following is not a characteristic of an experiment in its simplest form?

The most effective way to limit the effects of extraneous variables in an experiment is to use

A university researcher who wanted to determine the effectiveness of new technology in the teaching of freshman psychology used the new technology in one section, while a second section had the conventional lecture method.When the two sections were compared on final exam scores, the researcher was surprised to find that the conventional classroom actually had slightly higher scores.This finding may be an example of the

A researcher plans a special series of classroom lessons designed to increase students' verbal skills.A control group does not have the lessons.Which of the following would most likely be threats to internal validity?

Exhibit 10-7: Identify the threats to internal validity illustrated in the example below. -Refer to Exhibit 10-7.Some students left the experimental program because of a conflict with sports.

The most important criterion of an experimental design is that the design be

Exhibit 10-8: Choose the term that is described in each of the phrases below. -Refer to Exhibit 10-8.Considers groups to be statistically equivalent

Research has ____ validity when it accurately infers a significant relationship between the treatment and the dependent variable of the study.

Exhibit 10-2: In its simplest form, an experiment has three characteristics.Choose the characteristic that corresponds with each example. -Refer to Exhibit 10-2.One group had been rewarded with candy for turning in homework, while the other had verbal praise.

In experiments, the Hawthorne effect has its impact on the ____ group, while the John Henry effect impacts the group.