A health psychologist who wants to study the physical effects of caffeine recruits participants for the experiment by posting a sign-up sheet for anyone willing to participate. This procedure is an example of
A) random selection.
B) haphazard selection.
C) stratified selection.
D) type B selection.
Answer: B
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When the Irish immigrated to America during the potato famine, they ________
a. did not live in ethnic neighborhoods b. were welcomed by other White Americans c. encountered an emerging nativism d. could easily find jobs in the city
With a t test for dependent means, Population 2 will ordinarily have a mean of:
A) ?1 B) 0 C) +1 D) it varies from sample to sample
The plateau phase lasts:
a. a few seconds to about three minutes. b. anywhere from a few minutes to several hours. c. about three hours. d. until resolution is achieved.
Collins disagrees with theorists who perceive work and family ______.
a. as separate institutions b. as the same institution c. should be understood as oppositional forces of the same sphere d. to be the most important elements in considering motherhood