Exam 8: Experimental Design

Jesse states that in his experiment,he has counterbalanced his conditions.What does this mean?

In a _____ design,half of the participants receive only a posttest,and the other half receive both a pretest and a posttest.

If a repeated measures experiment produces 50 scores in treatment 1 and 50 scores in treatment 2,then the experiment must have employed

Which one of the following is NOT a type of order effect?

To study the effect of type of stimulus on memory recall,Hayden has participants receive either an auditory or visual presentation of a poem.After the presentation,participants are asked to answer several questions about the poem.Hayden has employed which type of experimental design?

A confounding variable is devastating to an experimental design because it

An investigator wanted to see whether packaging information affects the way teenagers rate the effectiveness of soap.The same soap was put in three packages: (a)a pink wrapper that says "For Keeping Your Skin Baby Soft";(b)a red wrapper that says "For Eliminating Acne";and (c)a white wrapper that says nothing.Each teenager was asked to rub his or her face with dirt and wash with soap A;each teenager then followed the same procedure for soaps B and then C.The time it took to get the face clean was recorded each time.What type of design is this?

How many participants would be needed for a repeated-measures experiment comparing four different treatment conditions,which investigated 20 participants in each treatment?

A researcher is interested in factors that influence perceptions of others.She presents participants with photographs of female super models and asks them to rate the attractiveness of each woman.She then presents participants with photographs of women of average attractiveness and again asks participants to rate the attractiveness of each woman.Surprisingly,she finds that participants rate the women of average attractiveness much lower than she expected.What effect may be responsible for the lower ratings?

When a confounding variable is present in an experiment,one cannot tell whether the results were due to the

Madison wants to examine the effect of a defendant's appearance on judgment of guilt for a crime.She has participants read an identical account of a crime except for the defendant's appearance.A group of high school students receive a description of an attractive defendant while a group of senior citizens receive a description of an unattractive defendant.Both groups are then asked to rate the defendant's guilt on a 7-point scale.A major confound in Madison's experiment is

A design that has two conditions with different participants in each condition is a(n)______ design.

A matched pairs design involves

McKenna designs a study in which she has two control and two experimental groups.In her design,one control group receives a pretest while the other does not,and one experimental group receives a pretest while the other does not.McKenna's design is an example of a _____ design.

A Latin Square design is used when

Improvement of performance as a result of repeated exposure to a task is referred to as a _____ effect.However,deterioration of performance as a result of repeated exposure to a task is referred to as a _____ effect.

In a Solomon four-group design,if there is no effect of the pretest,

When individuals participate in only one condition,it is a(n)_____ design.When individuals participate in all conditions,it is a(n)_____ design.

A researcher wants to find out how much fins increase swimming speed.This hypothesis could be tested with a counterbalanced repeated measures design by

A graduate student randomly assigns students in a class to taste either Coke or Pepsi.Students rate their liking for the soda on a scale from 1 to 10.This is an example of a(n)________ design.