Approximately what percent of American twelfth-graders smoke on a daily basis?
A) 31 B) 23 C) 11 D) 3
Answer: C
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Under what circumstances is the median likely to produce a better measure of central tendency than the mean?
a. With a symmetrical distribution b. With an extremely skewed distribution c. When the data consist of nominal measurements d. When the data are numerical scores from an interval or a ratio scale
When placed in a Skinner box, a rat is active, sniffing, poking, and exploring its environment, displaying behaviors that are _____
a. emitted c. respondent b. elicited d. extinguished
Neurons in the substantia gelatinosa release a. GABA only
b. GABA and Substance P. c. glutamate only. d. glutamate and Substance P.
Curtis is frightened by a loud noise in his crib. He extends his arms and legs outward and spreads his fingers and toes. What reflex is Curtis demonstrating?
A) the rooting reflex B) the grasping reflex C) the Moro reflex D) the swimming reflex