Researchers use control groups to
a. make comparisons to the treatment group
b. give all research participants an equal chance to participate in the study.
c. control the hypothesis.
d. randomize the experiment.
a
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In order to use the binomial distribution, which of the following conditions are necessary?
a. a series of N trials with only 2 possible outcomes b. outcomes are mutually exclusive c. there must be independence between trials d. P and Q must remain the same from trial to trial. e. all of these
For first births, what is the average length of labor?
a. 6 hours b. 12 hours c. 24 hours d. 36 hours
Addressing multiple problems in treatment lead to better outcomes for those with substance use disorders.
a. true b. false
In a psychological experiment, the participants were shown a collection of pictures depicting both pleasant and unpleasant aspects of their lives. They were instructed to smile whenever they saw an unpleasant picture. At the end of the experiment, the participants reported that they felt happy despite seeing the unpleasant pictures. Which of the following is exemplified in this experiment?
A. the continued influence effect B. the facial feedback effect C. the insufficient justification effect D. the overjustification effect