The famous case study of the group of true believers that formed around the psychic Marion Keech conducted by Festinger and his colleagues indicated that
a. members will leave a group when the costs become too great.
b. groups move through a conflict phase before they reach their cohesive peak.
c. individuals seek rewarding groups, rather than costly ones.
d. members who must invest in the group sometimes become more committed to it.
e. leaders can create cohesiveness by increasing esprit de corps within the group.
d. members who must invest in the group sometimes become more committed to it.
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A graphical representation of a frequency distribution in which vertical bars are centered above each category along the x-axis and are separated from each other by a space is a _____, and a graphical representation of a frequency distribution in which vertical bars centered above scores on the x-axis touch each other is a _____
a. histogram; bar graph b. frequency polygon; histogram c. bar graph; histogram d. frequency distribution; frequency polygon
Under which conditions would the sodium-potassium pump likely be far less effective in creating a concentration gradient?
A. if dendrites were generally longer than axons B. if the glia-to-neuron ratio were higher C. if selective permeability of the membrane did not exist D. if it were an active transport system that required energy
According to Darwin, facial expressions probably evolved to help us communicate our emotional states to others and provoke a response from them. This signaling function begins in __________
a. toddlers b. the teenage years c. young children d. infancy
According to evolutionary theory, women's level of parental investment means that the best strategy for females is to ______.
A. diversify genetic combinations B. require commitment C. choose older mates D. expand their field of eligibles