A population of scores is normally distributed with a mean of 100 and a standard
deviation of 20. Approximately _____ percent of the scores fall in the interval between 60
and 100.
a. 14
b. 34
c. 68
d. 48
D
Psychology
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A research design in which the researcher directly manipulates the independent variable and the assignment to treatment is a(n):
A) experimental design. B) quasi-experimental design. C) observational design. D) correlational design.
Psychology
Ronnie, a mentally challenged 45-year-old male, lives in a group home
He receives play money for cleaning his bedroom and other chores that he can later "spend" on group activities around the city, new clothes, or candy. Ronnie's behavior is being directed by a(n) _____ economy. Fill in the blank with correct word
Psychology