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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Indicate whether the statement is true or false

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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.

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Which of the following methods of reporting student progress is likely to be most reliable?

a. Letter grades (A, B, C, etc.) b. Letter grades with qualifiers (A+, A, A-, B+, B, B-, etc.) c. Percentage grades (99, 98, 97, etc.) d. Two-category grades (pass-fail, satisfactory-unsatisfactory, etc.)

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The value for the slope of the regression equation is ______.

a. always a positive number b. always a negative number c. either positive or negative d. a squared result

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