If taken within three days of vaginal intercourse, Plan B emergency contraception can reduce the likelihood of pregnancy by ____
a. 61% to 70%
b. 71% to 80%
c. 81% to 90%
d. 91% to 100%
C
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As Chapter 4 discusses, John Brown, Lloyd Peterson, and Margaret Peterson created a classic technique for assessing short-term memory
In this technique, people saw some stimuli, counted backwards by threes during the delay period, and then tried to recall the original stimuli. The results of their research showed that a. people could recall up to 10 stimuli, after a delay period of 3 minutes. b. people systematically recalled only 10% of the stimuli, on each trial in the study. c. at the beginning of the session, people could recall only 20% of the items; by the end of the session, they recalled about 40% of the items. d. after many previous trials, people had difficulty recalling the stimuli, even with only a short delay.
Which of the following is NOT a common symptom of depressive disorders?
a. disturbed eating and sleep patterns b. fleeting episodes of mania c. an inability to feel pleasure d. a negative self-image and feelings of worthlessness
Norms are closely tied to percentiles
Indicate whether this statement is true or false.
In a study of children reared in extremely depleted Romanian orphanages, the longer they remained in the orphanages, the
A) higher their IQ scores. B) more resilient they became to environmental stressors. C) higher their cortisol levels. D) lower their cortisol levels.