Which of the following statements regarding dizygotic (DZ) twins is FALSE?
A) DZ twins can be different sexes.
B) DZ twins can be very different in appearance.
C) DZ twins must have different fathers.
D) The occurrence of DZ twins varies across ethnic groups.
C
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Experiments differ from descriptive research techniques in that experiments ______.
A. use groups of participants that are carefully matched with respect to key variables B. track a group of participants for an extended period of time C. involve the random assignment of participants to conditions D. are conducted on only a single individual
The ________, which is involved in identifying, remembering, and responding to fear and aggression, takes its name from the Greek word for “________.”
a. ?amygdala; almond b. ?hypothalamus; seahorse c. ?dura mater; little mother d. ?hippocampus; spiral
In a two-way factorial ANOVA, the final F-ratio for Factor B is determined by dividing _____ by _____
a. MSFactor B; MSError b. MSError; MSBetween c. MSBetween; dfBetween d. MSFactor B; dfWithin
Adults who have failed to resolve their initiative-versus-guilt crisis may reveal their conflicts over taking initiative by _______.
a. self-restriction b. anxiety over ambitious strivings c. showing off d. all of the above