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What is an extraneous variable? Give an example of a study in which there is an extraneous variable, including how you would modify the study to solve the problem.

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An extraneous variable is a variable tha...

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A researcher is interested in examining the reaction times of first year students versus senior year students. She conducts her study in a room that is much colder than the rest of the building due to a heating malfunction. What is the nuisance variable in this study?


A) college rank (first year versus senior year)
B) reaction times
C) room temperature
D) the researcher

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Why are participant characteristics not true independent variables?


A) Participant characteristics are extraneous variables, not independent variables.
B) Participant characteristics are confounded with stimulus independent variables.
C) Participant characteristics are not manipulated by the researcher.
D) Participant characteristics are not operationally defined.

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Describe the purpose of the five basic control techniques.

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The purpose of the five basic control te...

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Describe the control technique of balancing and give an example.

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Balancing is a control technique used to...

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Age is considered a(n) _________ independent variable.


A) participant
B) physiological
C) stimulus
D) experience

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What are order effects? Describe carryover effects and give an example.

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Order effects refer to the impact that t...

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McKibban and Nelson (2001) assessed satisfaction with life in college students by using their scores on the Satisfaction with Life scale. What kind of dependent variable is this?


A) degree or amount
B) correctness
C) rate or frequency
D) latency or duration

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Describe any deception in this study.

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(1) Participants in the heart rate condi...

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What is ONE of the dependent variables?

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One dependent variable was attractivenes...

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Derek conducts a study in which half of the participants read a job application from a male candidate, and the other half read the same job application from a female candidate. He wants to make sure that each participant has an equal chance of reading the male job application as the female job application, so he uses the control technique known as


A) counterbalancing.
B) randomization.
C) constancy.
D) elimination.

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Daniel would like to study a new way of teaching research methods. There are two sections of research methods being taught at 2pm on Mondays and Wednesdays, so Daniel has one teacher use the new way and the other teacher use the old way. At the end of the semester, he finds that students who were taught the new way had higher grades than students taught the old way. What is the extraneous variable?


A) grades at the end of the semester
B) method of instruction (new versus old)
C) the two teachers
D) There is no extraneous variable in this study.

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A researcher is interested in creating equivalent groups in her experiment. If potential extraneous variables are unknown, she should use _________ and if the extraneous variables are known, she should use __________.


A) balancing; elimination
B) balancing; randomization
C) randomization; balancing
D) elimination; balancing

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Constancy can control for


A) nuisance variables only.
B) extraneous variables only.
C) both nuisance and extraneous variables.
D) neither nuisance nor extraneous variables.

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When the effects of one treatment persist and influence responses to the next treatment, the researcher has the problem of


A) social desirability.
B) experimenter bias.
C) carryover effects.
D) elimination.

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Explain why extraneous variables are so important to control.

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Extraneous variables are important to co...

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What is a dependent variable? Give examples of different types of dependent variables (correctness, rate or frequency, degree or amount, latency or duration).

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A dependent variable is the variable in ...

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Nuisance variables _________ the spread of scores within a distribution.


A) decrease
B) increase
C) first increase, then decrease
D) first decrease, then increase

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Describe the control technique of randomization. What is the logic of randomization, and what is its main drawback?

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The control technique of randomization i...

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What extraneous variables were controlled in this study?

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Valins (1966) used the same tape recorde...

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