In an investigation of the effects of caffeine on concentration, half the participants were given regular colas that contained caffeine and half were given decaffeinated colas. In this study, the decaffeinated colas are being used as
a. a confounding variable.
b. a random factor.
c. the dependent variable.
d. a placebo.
D
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Alexis brags excessively about her good looks and frequently deceives others in order to establish romantic relationships with them. Her behavior most clearly illustrates
A.
B.
C.
D.
Which of the following is probably the best explanation for why many people claim that they don't dream?
a. The pituitarisine in their brains does not activate the message of the thalamus while they sleep, so they do not experience "sensory events," or dreams, in their sleep. b. The dorsolateral hypothalamus is not actively connected to the ventromedial hypothalamus, and so they are incapable of coding their REM experiences as dreams. c. They do not experience the daily events, both positive and negative, that stimulate dream activities. d. They simply do not remember their dreams; however, if they were awakened during a REM stage, they would be much more likely to remember a dream that they just woke up from.
Six-year-old Aliou lives in a Baka village where each day he fetches water and minds his younger siblings. According to Erikson, Aliou will most likely develop a sense of
A) inferiority. B) initiative. C) autonomy. D) industry.
The larger the sample variance, the ______ that scores deviate from the mean on average.
A. farther B. closer C. either farther or closer D. neither farther nor closer