Exam 9: True Experiments

Professor Bosch asks one group of participants to memorize a list of nonsense syllables while distracted. Another group memorizes the list without distractions. He compares number of syllables recalled between the two groups. Which of the following is NOT represented statistically in his error variance?

What are parametric statistics? Give an example.

What are differential order effects? When would it be important to test for them?

What are nonspecific treatment effects? Give an example.

Simple random assignment is most effective when

Which of the following statements about factorial designs is TRUE?

A 3 x 2 x 2 factorial design has ________ independent variables.

__________ divide the variance in the dependent variable into variance caused by the independent variable and variance caused by everything else.

Name and define three characteristics of a good manipulation of an independent variable.

Think of a hypothesis you would like to test using an experimental design. For your study, would a within- or a between-subjects design be better? Explain your reasoning.

What is matched random assignment to conditions of an independent variable? Under what conditions is it most likely to be useful in controlling extraneous variance?

Explain why most experimental research uses no more than three independent variables.

You conduct an experiment is which you compare the effects of three levels of stress on aggression. The mean aggression scores are as follows (higher numbers indicate more stress): Low stress = 2.5; Moderate Stress=5.0; High Stress= 6.5. You conduct a one-way analysis of variance (ANOVA) and find a statistically significant F-value. You can correctly conclude that

From a statistical point of view, all variance in the dependent variable that is NOT caused by manipulation of the independent variable is called ________ variance.

You conduct an experiment in which you compare how people with one of three different psychiatric disorders respond to a new drug. Your independent variable can be described as being

Manipulation checks can take the form of

Your hypothesis proposes a curvilinear relationship between your independent variable and your dependent variable. Correctly testing this hypothesis will require a MINIMUM of ________ condition(s) of the independent variable.

Sensitization effects in within-subjects designs can lead to ________ that threaten the internal validity of the study.

Describe two types of information that researchers can collect and examine as part of a manipulation check.

What is a Latin Square design? How would you determine the number of orders it should have?