Which of the following calculations is necessary for figuring the correlation coefficient?
A) finding the grand mean
B) finding the cross-products of each person's X and Y raw scores
C) finding the means of X and Y
D) finding the difference between each person's X and Y raw scores
Ans: C) finding the means of X and Y
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Some people believe that subliminal "evil" messages recorded backward on rock music produce dangerous effects on listeners' behavior. What have psychological researchers concluded?
a. Backward messages do indeed produce strong, lasting effects on behavior b. Backward messages have weak and only brief effects on behavior. c. No rock group has in fact inserted any backward message on publicly available songs. d. Even if there were backward messages, they would have no effect on behavior.
Jill has a sexually transmitted disease that produces painful sores several times each year, but then she may go for months without any symptoms. She has been told that there is currently no cure for this disease. It is likely that Jill has
a. gonorrhea. b. Chlamydia. c. genital herpes. d. syphilis.
In which sleep disturbance does the person suffer from muscle twitches, primarily in the legs, that occur every 20 to 40 seconds, severely interrupting his or her sleep?
a. narcolepsy b. somnambulism c. hypnic jerk syndrome d. periodic limb movement syndrome
Which scenario BEST illustrates déjà vu?
A) suddenly believing that a life-altering experience is about to happen to you B) suddenly believing that you have been in a situation before, even though you cannot recall any details C) telling the same story to the same person multiple times and thinking that the person has not yet heard the story D) mistakenly thinking that you recognize someone