When the null hypothesis is rejected, then we know for certain that
a. the mean of the sample equals the mean of the population
b. the mean of the sample differs from the mean of the population
c. the mean of the sample is a biased estimator
d. none of these, since the statistical decision is a probability statement and not a statement of certainty
d
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Researchers Wells, Graham, and West have conducted a number of studies on male behaviour in bars, observing both bouncers and patrons. What conclusions have they reached?
A) Bouncers used excessive aggression against bar patrons when the bouncers were intimidated and needed to defend themselves. B) No conclusions can be drawn as it was just observational research. C) If threats or fights occur it is usually in response to direct provocation. D) They documented the existence of a macho subculture among male bar patrons. E) Patrons in bars often provoke the bouncers to become aggressive.
Feeling insects crawling on your skin (when none are really there) or hearing voices (when no one is around or no one is talking to you) would be examples of what symptom of schizophrenia?
A) compulsions B) delusions C) hallucinations D) obsessions