In a longitudinal study, a researcher:
a. Collects data from several groups of children, preferably on the same day, so that the groups can be compared
b. Examines how certain characteristics and behaviors change over time
c. Is able to prove whether future behavior is determined by earlier behavior
d. Observes two or more groups of children acting in a familiar setting
B
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Which of the following statements about force, distance, and machines is true?
a.............................. No machine can increase both force and distance at the same time. b.........................................................................................All machines increase force. c...........................................................All machines increase distance an object moves. d................................Some machines increase both force and distance at the same time.
Which of the following methods of reporting student progress is likely to be most reliable?
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