Dr. Krenshaw believes that people who are under stress will develop more colds than people who are not under stress. When he randomly selects 20 participants and exposes them to high levels of stress, he finds that 17 of the participants develop colds. Based on these results, Dr. Krenshaw concludes that stress causes an increase in the number of colds a person experiences. His reasoning may be
flawed because in this study:
a. there was no dependent variable
b. there was no control group for comparison
c. he didn't formulate a hypothesis before he collected his data
d. he didn't measure the independent variable when the study ended
B
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The notation is used instead of Y
a. to indicate that the answer is only approximate. b. to indicate that we have an equation for a straight line. c. to indicate that the result is a prediction. d. because this is a mathematical equation.
The median is the appropriate measure of central tendency when
a. the scale of measurement is nominal. b. the scores are ordinal, or when the distribution is skewed and the scores are interval or ratio. c. the scale of measurement is ratio. d. the distribution is symmetrical, and the scale of measurement is interval or ratio.
In the 1990s, a subcommittee was appointed by the American Psychology-Law Society and Division 41 of the American Psychological Association to review scientific evidence regarding eyewitness testimony. According to the subcommittee's recommendations, a person who conducts the lineup or photo spread in a case
a. should know the identity of the suspect. b. should tell the eyewitness that the suspect in the case appears in the lineup or photo spread. c. should ensure that the suspect doesn't stand out from the others in either appearance or dress. d. all of the above
When eyeblink conditioning is done in human subjects, it was found that it
A. does not occur. B. is impaired in participants with amygdalar damage. C. is impaired in participants with cerebellar damage. D. is retained in participants with amygdalar or cerebellar damage.