In studies that collected self-ratings by adolescents of impulse control and the tendency to take risks (Cauffman et al., 2010; Steinberg et al., 2008), impulse control did not approach adult levels until ages __________.
A. 10 to 12
B. 12 to 14
C. 15 to 17
D. 18 to 22
Answer: D
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Students from lower-income households are __________ more likely to drop out of high school than are middle- and higher-income students.
A. two times B. four times C. five times D. three times
According to the text, Americans are ____ richer than they were 50 years ago. At the same time, those who report that they are "very happy" ____ between 1957 and 1998
a. four to five times? increased b. six to seven times? decreased c. two to three times? decreased d. ten to twelve? increased
According to evolutionary theory on kin selection, monozygotic (identical) twins should help one another more than dizygotic (fraternal) twins
Indicate whether the statement is true or false
Using designs with more than two levels of an independent variable allows researchers to a. compare more than two kinds of treatment in one study
b. compare two or more kinds of treatment with a control group. c. compare a placebo group to the control and experimental groups. d. accomplish all of the other alternatives.