## The Psychologist

Psychology

## Quiz 10 :

Designing, Conducting, Analyzing, and Interpreting Experiments With Two Groups

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Q01 Q01 Q01

Understanding Experiments with Two Groups - Answer Key
Twenty sets of depressed twins are obtained for a study on the effects of a new antidepressant. In each twin set, one twin is assigned to receive the drug, and the other is designed to receive the placebo. Three months later, depression levels are measured on a scale from 1 (not at all depressed) to 7 (very depressed). The following data was obtained:
-What is the independent variable?

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type of drug (drug, placebo)

Q02 Q02 Q02

Understanding Experiments with Two Groups - Answer Key
Twenty sets of depressed twins are obtained for a study on the effects of a new antidepressant. In each twin set, one twin is assigned to receive the drug, and the other is designed to receive the placebo. Three months later, depression levels are measured on a scale from 1 (not at all depressed) to 7 (very depressed). The following data was obtained:
-What is the dependent variable?

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depression level

Q03 Q03 Q03

Understanding Experiments with Two Groups - Answer Key
Twenty sets of depressed twins are obtained for a study on the effects of a new antidepressant. In each twin set, one twin is assigned to receive the drug, and the other is designed to receive the placebo. Three months later, depression levels are measured on a scale from 1 (not at all depressed) to 7 (very depressed). The following data was obtained:
-What is the scale of measurement for the dependent variable?

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interval

Q04 Q04 Q04

Understanding Experiments with Two Groups - Answer Key
Twenty sets of depressed twins are obtained for a study on the effects of a new antidepressant. In each twin set, one twin is assigned to receive the drug, and the other is designed to receive the placebo. Three months later, depression levels are measured on a scale from 1 (not at all depressed) to 7 (very depressed). The following data was obtained:
-What kind of research design was used?

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Q05 Q05 Q05

Understanding Experiments with Two Groups - Answer Key
Twenty sets of depressed twins are obtained for a study on the effects of a new antidepressant. In each twin set, one twin is assigned to receive the drug, and the other is designed to receive the placebo. Three months later, depression levels are measured on a scale from 1 (not at all depressed) to 7 (very depressed). The following data was obtained:
-What kind of statistical analysis was used?

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Q34 Q34 Q34

Frances wishes to study the effects of violent videogames on children's levels of aggression. As children come to the lab for the study, she flips a coin. If it turns up heads, the child plays a violent videogame. If it turns up tails, the child plays a nonviolent videogame. Frances has used the technique of

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Multiple Choice

Q40 Q40 Q40

Bernice conducts a study on the effects of violent television on children. She obtains a sample of 30 aggressive children and 30 non-aggressive children. She has the aggressive children watch 15 minutes of aggressive television and the non-aggressive children watch 15 minutes of non-aggressive television. This study represents a _________ study.

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Q46 Q46 Q46

Beth is interested in studying the effects of movies on peoples' attitudes toward the mentally ill. She obtains a sample of college students who have never seen One Flew Over the Cuckoo's Nest. Half of the students watch the movie and half do not, and then she measures their attitudes toward the mentally ill. She is worried that if participants have a loved one who is mentally ill, they may have different attitudes from everyone else. She decides to give a pretest to determine if people have family members with a mental illness to make sure that there are equal numbers of such people in both the experimental and control groups. Beth is using

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Multiple Choice

Q89 Q89 Q89

Samantha had one group of participants watch a violent hockey game and had the other group watch a nonviolent hockey game. She pretested participants on their levels of trait aggressiveness to make sure there were equal numbers of such people in both groups. She measured physiological arousal in response to the game. Samantha used a(n) ________ design and should analyze her data using a(n) __________ samples t test.

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Multiple Choice

Q94 Q94 Q94

Questions 77 - 83 refer to the following computer output in which a researcher compared the GPA of traditional (aged 18-22) and nontraditional (aged 23 or older) students.
Table 10-1
-Consult Table 10-1. The statistical analysis is a(n) __________ samples t test.

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Q96 Q96 Q96

Questions 77 - 83 refer to the following computer output in which a researcher compared the GPA of traditional (aged 18-22) and nontraditional (aged 23 or older) students.
Table 10-1
-Consult Table 10-1. The mean GPA for traditionally-aged students was ______ and the mean GPA for nontraditionally-aged students was _______.

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Multiple Choice

Q97 Q97 Q97

Questions 77 - 83 refer to the following computer output in which a researcher compared the GPA of traditional (aged 18-22) and nontraditional (aged 23 or older) students.
Table 10-1
-Consult Table 10-1. The data indicate ________ of variance; therefore, we should use the output under _________________.

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Q98 Q98 Q98

Questions 77 - 83 refer to the following computer output in which a researcher compared the GPA of traditional (aged 18-22) and nontraditional (aged 23 or older) students.
Table 10-1
-Consult Table 10-1. The p-value is _______ than .05; therefore, we should conclude that there _______ a difference between the groups.

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Q100 Q100 Q100

Questions 77 - 83 refer to the following computer output in which a researcher compared the GPA of traditional (aged 18-22) and nontraditional (aged 23 or older) students.
Table 10-1
-Consult Table 10-1. The difference in means ______ significant; therefore, we conclude that the difference between the two means is due to ________.

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Multiple Choice

Q103 Q103 Q103

Questions 84 - 87 refer to the following computer output in which a researcher measured anxiety in a sample before therapy and after therapy.
-Consult Table 10-2. The p-value is _______ than .05; therefore, we should conclude that there _______ a difference between the groups.

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Multiple Choice

Q104 Q104 Q104

Questions 84 - 87 refer to the following computer output in which a researcher measured anxiety in a sample before therapy and after therapy.
-Consult Table 10-2. The difference in means ______ significant; therefore, we conclude that the difference between the two means is due to ________.

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Multiple Choice