Chat with us, powered by LiveChat RU Identifying Hypotheses Independent & Dependent Variables Questions - Uni Pal

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Section 1 – Practice 
Instructions:
Briefly (approximately a paragraph) answer each question below.
Scenario A:  A professor is interested in whether taking online quizzes over a chapter before discussing the chapter in class will improve students’ test performance.  The professor is interested in examining the testing effect, the finding that taking a memory test not only assesses what one knows, but also enhances later retention.  The professor hypothesizes that students who take chapter quizzes will score higher on the midterm exam than students who do not take chapter quizzes.

Design and describe an experiment that could test this hypothesis. ___
Identify the IV and DV. ___
Provide an operational definition of each variable. ___

Scenario B: Consider the following experiment.  Each participant interacted for an hour with another person who was actually a research confederate (an actor working for the researcher). The confederate either presented herself as similar or dissimilar to the participant. After this interaction, both persons agreed to return 1 week later for another session with each other. When the real participants returned, they were falsely informed that the person they had met the week before had died. The researchers then compared how long the participant spent viewing a picture of the “deceased” depending on whether the person had presented as similar or dissimilar to them.  The participant was never told that the reported death was untrue.

Write a hypothesis that is tested in this study. ___
Discuss the ethical issues raised in the experiment. ___
What would you recommend the experimenters do to protect the participants and minimize the risk of harm? ___

Section 2 – IV and DV Practice 

Hypothesis: Jury decisions will be influenced by the attractiveness of the defendant.

What is the IV? ___
What is the DV? ___

A drug company is advertising a new drug that helps people recover from jet lag faster.  You are skeptical, so you conduct an experiment to test their claim.  In your experiment, 100 people are flown from San Francisco to Tokyo.  During the flight, half the subjects are given the drug company’s new drug.  The other half are given a placebo (i.e., sugar pill) during the flight.  Six hours after they land, all participants are asked to rate how sleepy and disoriented they feel.

What is the IV?  List all levels. ___
What is the DV? ___

i.How is it measured? ___

A researcher wants to know whether children who play a musical instrument have better academic performance than children who do not play a musical instrument.  At the beginning of the school year, the researcher takes a group of 100 children and randomly assigns 50 of them to learn a musical instrument of their choice, and the other 50 continue life as normal without learning a musical instrument.  At the end of the school year, all 100 children take standardized reading and math tests.

What is the IV?  List all levels. ___
What is the DV? ___

i.How is it measured? ___

A researcher wants to know whether participating in cognitive-behavioral therapy (CBT) is effective in reducing depression symptoms.  The researcher recruits 200 participants who are clinically diagnosed with depression and randomly assigns half of them to attend weekly sessions of CBT for 6 months, while the other half of participants take part in art therapy once a week for 6 months.  At the end of the 6-month period, the researcher administers the Beck Depression Inventory (a clinical measure of depression symptoms) to all 200 participants.

What is the IV?  List all levels. ___
What is the DV? ___

i.How is it measured? ___

A drug company has created a new drug that they claim reduces symptoms of anxiety in adults with Generalized Anxiety Disorder (GAD).  A group of researchers wants to verify this claim.  The researchers gather 400 participants who all have a clinical diagnosis of GAD.  The participants are split and randomly assigned to groups of 100.  Group 1 takes 0mg of the anxiety medication.  Group 2 is given a placebo each day.  Group 3 takes 10mg a day of the anxiety medication.  Group 4 takes 20mg a day of the anxiety medication.  After 3 months, a trained clinician assesses how many symptoms of anxiety each participant shows.

What is the IV?  List all levels. ___
What is the DV? ___

i.How is it measured? ___

A researcher wants to know whether gender and ethnicity impact political views in the United States.  The researcher gathers 500 adult participants.  The sample is evenly gender-split between males and females.  The sample is ethnically representative of US adults.

What is/are the IV(s)?  List all levels. ___
What is the DV? ___

Section 3 – Operationally Defining Variables 

A researcher thinks that college athletes are not as intelligent as other students (how rude!).  The researcher gathers a random sample of 100 college athletes and 100 non-athlete college students.  The researcher administers the Stanford-Binet IQ test to all participants.  The researcher also collects cumulative GPA for all participants.
A researcher wants to know whether violent video games increase aggression in children.  The researcher gathers a sample of 200 6-8-year-olds and randomly assigns half of them to play a violent video game and the other half to play a non-violent video game.  Each group plays their assigned game for 2 hours.

What is the IV? ___
What is the DV? ___
Provide 2 operational definitions for the DV in the above study.

i.___
ii.___

A researcher wants to know whether eating chocolate increases happiness.

What is the IV? ___
What is the DV? ___
Provide 2 operational definitions for the DV in the above study.

i.___
ii.___

A researcher wants to know whether lavender decreases stress.

What is the IV? ___
What is the DV? ___
Provide 2 operational definitions for the DV in the above study.

i.___
ii.___

A researcher wants to know whether social media use affects self-esteem in adolescents.

What is the IV? ___
What is the DV? ___
Provide 2 operational definitions for the DV in the above study.

i.___
ii.___

Section 4 – Hypotheses 

A researcher wants to know whether violent video games increase aggression in children.  The researcher gathers a sample of 200 6-8-year-olds and randomly assigns half of them to play a violent video game and the other half to play a non-violent video game.  Each group plays their assigned game for 2 hours.
A researcher thinks that college athletes are not as intelligent as other students (how rude!).  The researcher gathers a random sample of 100 college athletes and 100 non-athlete college students.  The researcher administers the Stanford-Binet IQ test to all participants.  The researcher also collects cumulative GPA for all participants.

Write a hypothesis that is tested in this study. ___
Write a second hypothesis that is tested in this study. ___

A researcher wants to know whether participating in cognitive-behavioral therapy (CBT) is effective in reducing depression symptoms.  The researcher recruits 200 participants who are clinically diagnosed with depression and randomly assigns half of them to attend weekly sessions of CBT for 6 months, while the other half of participants take part in art therapy once a week for 6 months.  At the end of the 6-month period, the researcher administers the Beck Depression Inventory (a clinical measure of depression symptoms) to all 200 participants.

Write a hypothesis that is tested in this study. ___

A researcher wants to know whether children who play a musical instrument have better academic performance than children who do not play a musical instrument.  At the beginning of the school year, the researcher takes a group of 100 children and randomly assigns 50 of them to learn a musical instrument of their choice, and the other 50 continue life as normal without learning a musical instrument.  At the end of the school year, all 100 children take standardized reading and math tests.

Write a hypothesis that is tested in this study. ___
Write a second hypothesis that is tested in this study. ___

A researcher wants to know whether social media use affects self-esteem in adolescents.

Write a hypothesis that is tested in this study. ___

A researcher wants to know whether eating chocolate increases happiness.

Write a hypothesis that is tested in this study. ___

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