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Dr. Kalmagura plans on introducing a new exam review procedure in his chemistry classes. To check the effectiveness of the new procedure he is going to have half his students try the new technique for one semester, while the remaining students review in the way they have always done in the past. He asks each student to decide which of the techniques they would like to use, the new technique or the standard technique. In this example, Dr. Kalmagura's procedure illustrates


A) the use of non-random assignment.
B) a correlational research design.
C) a double-blind research design.
D) what is meant by informed consent in research.

E) A) and B)
F) B) and C)

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A group of researchers wanted to determine whether children would behave more aggressively after watching violent television programming. Half the children in the study watched a violent television show; the other children watched a non-violent television program. In this study, the control group is the children who


A) behave the most aggressively at the end of the study.
B) watch the non-violent program.
C) watch the violent show.
D) behave the least aggressively at the end of the study.

E) A) and B)
F) A) and C)

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Diaz conducts a decision-making experiment to determine if people reason more logically when they have more time to decide. All the participants who are under 40 are allowed 15 minutes to reach a decision about a problem; all the participants who are over 40 are allowed 20 minutes to reach a decision about the same problem. Diaz has a problem with his experimental design because


A) there are two control groups and no experimental group.
B) the time allowed for the decision is confounded with the independent variable.
C) there is no dependent variable in the experiment.
D) the age of the participants is confounded with the independent variable.

E) B) and D)
F) A) and D)

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A standardized measure used to obtain a sample of a person's behavior is called


A) a psychological test.
B) a case study.
C) an experiment.
D) a survey.

E) A) and B)
F) A) and C)

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The FINAL step in a scientific investigation is to


A) conduct the study.
B) analyze the data.
C) decide whether or not the hypothesis was supported.
D) report the findings.

E) A) and B)
F) A) and C)

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Dr. Redding has found a correlation of +0.65 between snoring and weight. This indicates that


A) overweight individuals tend to snore less than underweight individuals.
B) there is no relationship between weight and snoring.
C) overweight individuals tend to snore more than underweight individuals.
D) individuals who go on a diet will most likely begin to snore.

E) B) and D)
F) A) and B)

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Of the following, the correlation coefficient that indicates the weakest relationship between the two variables being measured is


A) +0.95.
B) -0.69.
C) +0.01.
D) -4.50.

E) A) and B)
F) C) and D)

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If there is a relationship between amount of coffee consumed daily and number of hours slept, such that people who drink a lot of coffee tend to sleep very little (and people who drink little coffee tend to sleep a lot) , coffee consumption and hours slept would show a(n)


A) increasing correlation.
B) decreasing correlation.
C) positive correlation.
D) negative correlation.

E) A) and B)
F) None of the above

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A scientific theory has to be


A) true.
B) accepted by others.
C) testable.
D) well established and not disputed.

E) A) and B)
F) A) and C)

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An independent variable in an experiment refers to


A) the variable that is held constant across experimental conditions.
B) the variable deliberately manipulated by the experimenter.
C) the variable that the experimenter believes will change in value because of systematic correlations that exist in the experiment.
D) the variable that provides an alternative explanation for the results of the experiment.

E) A) and D)
F) B) and C)

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