Which correlation coefficient represents the weakest association between the X and Y
variables?
a. r= +.20
b. r= +.60
c. r= -.50
d. r= -.90
A
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In random assignment, the group that receives no treatment is called the ________ group
a. dependent variable c. causal b. experimental d. control
There is a joke among scientists about a researcher who tells others that he belongs to a secret scientific society, where no one but the researcher will ever know about the studies members are doing
This joke is humorous because it violates the principle of a. determinism. b. control groups. c. open-mindedness. d. public verifiability.
Which of the following is an example of a systems theory approach?
a. social exchange theory b. an input-process-output model of group productivity c. self-categorization theory d. Skinner’s behaviorism
If a research article reports that "The mean performance scores for the Normal Sleep, Reduced Sleep, and No Sleep groups were 18.0, 16.6, and 15.6, respectively, F(2, 36 ) = 2.95, p< .05," the most accurate conclusion is that
A) people who get no sleep perform significantly worse than people who sleep a reduced amount. B) people who get no sleep perform significantly better than people who sleep a normal amount. C) the three groups do not all come from populations with the same mean, although it is not clear which population means are different. D) conclusions about the relationship between amount of sleep and performance cannot be drawn from these results.