Exam 4: Basic Experimental Design
In the Isen, Daubman, and Nowicki (1987) experiment on positive affect and problem solving, the independent variable was:
B
When participants are exposed to only one level of a given independent variable, they are probably taking part in a:
B
Why is it accurate to say that the value of the dependent variable depends on the independent variable? Explain.
In statistics and mathematics, variables are quantities that can be changed or varied. They are typically divided into two categories: dependent and independent variables.
The dependent variable is the one that is being studied and measured in an experiment or study. Its value depends on the effects of the independent variable. On the other hand, the independent variable is the one that is manipulated or controlled in an experiment or study.
It is accurate to say that the value of the dependent variable depends on the independent variable because the purpose of the independent variable is to influence or cause some kind of change in the dependent variable.
For example, in a study examining the effect of study hours on test scores, the number of study hours would be the independent variable (as it can be controlled and manipulated by the researcher), and the test scores would be the dependent variable (as they are the outcome being measured and they depend on the number of hours spent studying).
Therefore, the relationship between these two types of variables is such that a change in the independent variable will cause a change in the dependent variable. This is why it is accurate to say that the value of the dependent variable depends on the independent variable.
Which is worse in an experiment: random error or systematic error? Why?
Why are subject variables said to be "immune to randomization"? What do social psychologists do to deal with the potential problems posed by subject variables?
Explain the distinction between descriptive and operational definitions. Use examples to illustrate your points.
List some of the advantages of experiments over other sorts of studies (e.g., observational research, correlational research).
Why should a social psychologist need to have a control in an experiment? What is the specific purpose of a control group?
The age, race, education, and marital status of research participants are all variables that cannot be controlled by an experimenter. Yet, these variables could alter the participants' actions in an experiment. Psychologists call these variables:
A social psychologists posts a "call for volunteer participants" on a bulletin board in the psychology lounge. Students then sign up to take part in research for extra credit. These students constitute a:
In the Isen, Daubman, and Nowicki (1987) experiment on positive affect and problem solving, the dependent variable was:
What are carryover effects? When do they occur in the context of research designs? List and describe three carryover effects.
What is the role of random assignment in true experiments? How does random assignment affect the influence of individual differences (also known as subject variables)?
The Isen, Daubman, and Nowicki (1987) experiment on positive affect and problem solving is best classified as:
According to Isen, Daubman, and Nowicki (1987) and other social psychologists, how does positive affect or good mood affect people's problem solving abilities?
A ____ definition portrays the relationships among variables in an abstract way, while a ____ definition transforms variables into concrete forms that can be manipulated and measured.
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