Extraneous Variable
In experimental research, an extraneous variable is any factor that varies within the context of a study other than the specific independent and dependent variables being investigated. These variables pose a significant problem because many of them are likely to influence the dependent variable. If these outside factors fluctuate, they introduce competing influences that make it difficult to separate the true effect of the independent variable from the effects of the extraneous variables.
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Research Methods in Psychology - 4th American Edition @ KPU
OpenStax Psychology (2nd ed.) Textbook
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A social psychologist wants to determine if the number of bystanders present during an emergency affects how long it takes for an individual to help. The psychologist stages an emergency in a public space and systematically varies whether there are one, three, or ten other people present. The researcher then measures the time it takes for a participant to intervene and offer assistance. In this experiment, what is the dependent variable?
Example of an Experiment: Note-Taking Method and Learning Performance
Extraneous Variable
Time Series
Confounding Variable
Internal Validity
Null Result
Non-Experimental Research
In an experimental study, which of the following best describes the dependent variable?
In a psychological experiment investigating whether a new mnemonic technique improves memory recall, the students' memory recall scores represent the dependent variable.
Match each psychological research scenario with the specific dependent variable that would be measured to evaluate the presumed effect of the study's conditions.
A researcher investigates whether practicing mindfulness for ten minutes a day reduces anxiety scores on a standardized test. Arrange the logical steps for analyzing the role of the dependent variable in this investigation.
A researcher evaluates whether 'heart rate' or 'self-reported anxiety' is a more valid measure of the presumed effect in a study on stress. This judgment specifically addresses the quality and appropriateness of the ________ variable.
Suppose you are constructing an experimental protocol to investigate if 'ambient peppermint scent' improves 'cognitive focus' during a repetitive task. To create a valid dependent variable that measures the presumed effect of the scent, which of the following measurement strategies should you propose?
In a psychological experiment, the dependent variable is the factor that the researcher actively manipulates to determine its causal effect.
Match each core aspect of a dependent variable in a psychological experiment with the statement that best describes its function or behavior.
A researcher randomly assigns participants to either a quiet room or a noisy room and asks them to study a list of 30 vocabulary words for 10 minutes. Afterward, all participants complete a written recall test. The researcher records how many words each participant correctly recalled. In this experiment, the number of words correctly recalled is the _____, because it is the factor measured to evaluate whether the manipulation of the environmental condition produced a change.
A researcher proposes using 'number of errors made on a 10-minute proofreading task' as the dependent variable in a study on whether mental fatigue (induced by 60 minutes of continuous cognitive work) impairs attention. Arrange the following evaluative steps in the logical order a researcher should follow to determine whether this dependent variable is appropriate for the study.
Define a dependent variable in the context of an experimental study. In your explanation, identify what it represents in a causal relationship and describe how it is used by researchers in relation to the independent variable.
Explain how the concept of a dependent variable is demonstrated in this study. In your response, identify the specific dependent variable and explain why it is characterized as the presumed effect.
In an experiment testing the effect of sleep duration (4 hours vs. 8 hours) on cognitive processing speed, identify the dependent variable and state how the researcher applies it to evaluate the causal relationship.
In a psychological experiment, how is the dependent variable best defined?
A researcher conducts an experiment to evaluate if daily meditation reduces stress levels in college students. In this scenario, the students' stress level represents the ____ variable.
Match each brief psychological research scenario to the specific dependent variable that the researchers are measuring.
A cognitive psychologist theorizes that drinking caffeinated coffee increases word recall. The researcher assigns half the participants to drink caffeinated coffee and the other half to drink decaffeinated coffee, then measures their recall scores. In this experimental structure, the type of coffee consumed acts as the dependent variable because the final results depend on it.
A researcher designs an experiment to test if a new study technique improves students' memory retention. The researcher manipulates the study technique (the independent variable) but decides to measure the students' self-reported enjoyment of the technique as the dependent variable to evaluate the study's outcome. Evaluate this experimental design and identify the primary flaw regarding how the dependent variable is utilized.
Based on its role in evaluating a causal relationship, arrange the logical sequence of events that demonstrates how a dependent variable is utilized in a basic psychological experiment.
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A peer review committee is deconstructing an experiment that investigated whether expressive writing reduces depressive symptoms. In analyzing the study's causal structure, they map the expressive writing task as the manipulated cause. They then identify the depressive symptoms—the factor measured to evaluate if a direct change occurred as a result of the manipulation—as the ____ variable.
Evaluate the choice of dependent variable in each of the following psychological experiment scenarios. Match each experimental scenario to the most accurate critique of how the dependent variable is utilized.
Which of the following best defines a dependent variable in an experimental study?
If a research team conducts an experiment to determine whether taking a new medication reduces the frequency of panic attacks, the new medication serves as the dependent variable.
Apply your understanding of experimental design by identifying the dependent variable in each scenario. Match the research scenario to its specific dependent variable.
Analyze the causal structure of a psychological experiment by arranging the following steps in the logical order required to properly evaluate the dependent variable.
A peer reviewer evaluates a research paper claiming that a new mindfulness app decreases stress. The reviewer notes that the researchers manipulated app usage but only tracked the number of app downloads, completely failing to measure the participants' actual stress levels. The reviewer rejects the paper, justifying this decision by pointing out that the study's fatal flaw is the lack of a valid ____ variable to assess the presumed effect.
In a psychological experiment, the dependent variable is the factor that researchers actively manipulate to evaluate a causal relationship.
Researchers manipulate one factor in an experiment and then measure another factor to see if there is a change. Why is this measured factor referred to as the 'dependent' variable?
A clinical psychologist conducts a study to investigate whether a new cognitive-behavioral therapy protocol reduces social anxiety in adolescents. After six weeks, the adolescents complete a standardized social anxiety questionnaire. In this experimental design, the adolescents' scores on the questionnaire serve as the ____ variable.
Analyze the structure of a psychological experiment investigating the impact of caffeine on problem-solving ability. Match each specific element of the study to its functional role regarding the dependent variable.
As a peer reviewer evaluating a psychological experiment, you must critically judge whether the study's measured outcome provides robust evidence for its causal claims. Arrange the following steps in the correct logical sequence to thoroughly evaluate the appropriateness and validity of the study's dependent variable.
Example of a Dependent Variable: Classroom Learning Measurement
In a psychological experiment, how is the dependent variable defined?
In a psychological study investigating whether studying with background music improves test performance, the students' test performance is the dependent variable.
Apply your knowledge of experimental design by matching each psychological research scenario to its specific dependent variable.
A research team evaluates a study assessing whether varying the duration of sleep (4, 6, or 8 hours) alters the number of words recalled from a memorized list. In dissecting the causal structure of this experiment, the duration of sleep is the manipulated cause, whereas the number of words recalled functions as the ____.
You are evaluating a flawed psychological experiment claiming that a new therapy reduces anxiety. The researchers manipulated the therapy type, but they measured 'whether participants smiled as they left the room' to evaluate the effect. Arrange the steps you would take to logically critique the dependent variable in this study.
Within an experimental design, the factor that represents the presumed effect and is measured by researchers is called the ____ variable.
A research team wants to determine if consuming caffeine before a cognitive task improves participants' memory recall scores. Which of the following best identifies the dependent variable in this study?
An educational psychologist conducts an experiment to see if a new interactive reading software increases reading comprehension scores in second-grade students compared to traditional textbooks. In this study, the interactive reading software represents the dependent variable.
Learn After
Participant Variable
Situational Variable
Task Variable
Experimental Control
Experimenter's Sex as an Extraneous Variable
Standardizing the Procedure
Experimenter Expectancy Effect
Example of Extraneous Variables: Expressive Writing Experiment
Confounding Variable
Internal Validity
In the context of an experiment, what is an extraneous variable?
In a study examining whether caffeine improves focus, the amount of sleep a participant had the night before would be considered an extraneous variable if it varies between participants and could potentially influence the results.
In psychological research, factors other than the primary ones being studied can often influence the results. Match each research study with the specific factor that would act as an extraneous variable in that scenario.
A researcher conducts a study to see if 'Bright Lighting' (the factor being tested) improves 'Reading Speed' (the performance being measured). However, the group in the bright light reads an interesting novel, while the group in the dim light reads a technical manual. Arrange the following statements to represent the logical sequence of how this extraneous variable (Topic Interest) creates ambiguity in the study's results.
True or False: In experimental research, an extraneous variable is defined as any factor that varies within the context of a study other than the specific variables being investigated.
In an experiment, why does the presence of an extraneous variable that varies within the study make it difficult to draw clear conclusions about the relationship between the independent and dependent variables?
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A researcher is conducting an experiment to see if a new mnemonic strategy improves memory recall. Match each element of this research study to its correct classification.
A researcher designs an experiment to measure the effect of cell phone use on reaction times. If the participants' age varies throughout the study and potentially affects reaction times, the researcher must recognize age as a/an _____ variable because it is a factor other than the independent and dependent variables that could introduce competing influences.
Order the steps a researcher should take to evaluate and manage potential threats to internal validity from factors outside the primary hypothesis.
Define the term 'extraneous variable' in the context of experimental research. In your definition, explain the primary challenge that fluctuating extraneous variables present to researchers who are trying to evaluate the relationship between an independent variable and a dependent variable.
Based on the concept of extraneous variables, diagnose why the room temperature and lawnmower noise are classified as extraneous variables in this study, and explain how these fluctuating factors affect the researcher's ability to detect the true effect of the cognitive training exercise.
A researcher is conducting an experiment to evaluate the effect of a new distraction-free interface on task completion speed. However, the researcher realizes that the brightness of the computer monitors fluctuates across different testing stations. Apply the concept of experimental control to manage this monitor brightness extraneous variable, and explain how this application improves the study's design.
In experimental research, how is an extraneous variable defined?
A researcher is studying whether a new teaching method improves math test scores. If the students in the new method group also happen to get more sleep than the control group, the amount of sleep is considered an extraneous variable.
A researcher is evaluating two different math tutoring programs. The students in the first program happen to have a highly experienced teacher, while the students in the second program have a novice teacher. Because teacher experience varies within the study context and introduces competing influences on student performance, teacher experience is considered an ____ variable.
A cognitive psychologist investigates whether listening to classical music during study sessions improves test performance. One group of participants listens to Mozart while reading a chapter, and the other group reads the chapter in silence. The psychologist then records their scores on a comprehension quiz. However, the classical music group happens to be tested in the morning, while the silent group is tested late in the afternoon. Match each element of this study design to the correct variab
A researcher is evaluating an experiment that tests the effect of a new memory technique (independent variable) on recall scores (dependent variable). Evaluate the following factors that vary within the study's context. Arrange them in order from the LEAST problematic variation (1) to the MOST problematic extraneous variable (3).
In experimental research, extraneous variables are the specific factors that a researcher intentionally manipulates to observe their effects.
A researcher is studying whether a new reading program improves student vocabulary scores. Why would fluctuating noise levels across the different testing rooms be considered an extraneous variable in this study?
A health psychologist investigates whether a new mindfulness app reduces stress levels. Participants are assigned to use the app for either 5 minutes or 20 minutes a day. At the end of the month, stress is measured via a standardized questionnaire. However, during that month, several participants happen to go on a week-long vacation, significantly reducing their stress independent of the app. Match each research term to the corresponding factor from this scenario.
A clinical psychologist conducts an experiment to determine if a new therapy reduces anxiety symptoms more effectively than a traditional therapy. Patients who schedule morning appointments are assigned to the new therapy group, while patients who schedule afternoon appointments are assigned to the traditional therapy group. After eight weeks, anxiety symptoms are measured using a standardized questionnaire. Upon analyzing this experimental design, what is the extraneous variable, and why does i
A psychologist concludes that a new cognitive training app is more effective than standard crossword puzzles for improving memory. Upon evaluating the study's design, you note the following: the app group practiced for 30 minutes a day in a quiet university laboratory, while the puzzle group practiced for 30 minutes a day in a noisy community center. Both groups consisted of participants selected from the same pool of adults aged 60 to 70. Based on the concept of extraneous variables, which of t