Dr. Prentice, principal of an elementary school, instructs her teachers to employ a new aggression-reduction program with the second graders, and to keep using it on that group of students for the next three years

She finds that relative to the start of the program, aggression in that group of students is down 35%. This example illustrates the possibility of ________________ as a plausible rival hypothesis.

a. history
b. maturation
c. attrition
d. selection


B

Political Science

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Indicate whether the statement is true or false

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