Why is a confounding variable unacceptable in a true experiment?
a. It can distort the effect of the independent variable
b. It can disrupt the normal behavior of participants.
c. It threatens internal validity by providing an alternative explanation for the results.
d. It creates a directionality problem that undermines a cause-and-effect conclusion.
c
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What suggested that a woman in a vegetative state was conscious?
a. She turned toward the voices of familiar people but not unfamiliar people. b. Part of her brain responded to the instruction, "imagine playing tennis.". c. She occasionally smiled or frowned while music was playing. d. Painful stimuli caused an increase in her body temperature.
Which of the following motor tasks appears to have at least a partial biological explanation?
a. Running b. Throwing a ball c. Playing kickball d. Dancing
Sexually dimorphic structures have been identified in the human brain
a. True b. False Indicate whether the statement is true or false
Which of the following statements is supported by cross-cultural research on sexuality?
A) Most North American adolescents get information from parents about sexually transmitted diseases and contraception. B) Sexual attitudes in North America are liberal compared to other Western nations. C) In some cultures, adolescents are expected to engage in sexual experimentation with a variety of partners. D) Rates of extramarital sex among North American adolescents have risen sharply in recent decades.