The difference between a t test for a single sample and a Z test for a single sample is the way
A) the problem is restated as a research hypothesis and a null hypothesis about the populations.
B) the mean of the known population is determined.
C) the variance of the known population is determined.
D) the decision about whether to reject the null hypothesis is made.
C
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A teacher asks the school psychologist to observe her class
through the two-way mirror and determine why the class disruptions are occurring. Just as the psychologist is walking into the room off to the side of the classroom to observe, the teacher assistant tells the psychologist, "Pay close attention to Claire and Robert over there by the maps. I think they are the real troublemakers in the class." After this encounter, the school psychologist will have to struggle with the a. observer effect. b. observer bias. c. placebo effect. d. anthropomorphic error.
How did the Harrison Act impact drug use in America?
a) It restricted access to opium-related drugs via taxation b) It banned the sale and use of alcohol for 13 years from 1920-1933. c) It forced marijuana growers and sellers to obtain tax certificates and made the certificates impossible to obtain, effectively making marijuana illegal. d) It established the Drug Enforcement Administration and drug schedules.