If a researcher manipulated the length of a school day and measured attendance rates in seventh versus 12th graders while controlling for socioeconomic status (SES), which of the following would be the independent variable (IV), dependent variable (DV), attribute variable (AV), and extraneous variable, respectively?
A) grade level; length of school day; SES; attendance rate
B) length of school day; attendance rate; grade level; SES
C) attendance rate; SES; length of school day; grade level
D) attendance rate; grade level; SES; grade level
Ans: B
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What is the correlation between the following? X Y 1.3 1.6 –1.2 –1.0 –0.1 –0.2 0.5 0.3 –0.8 –0.6
A. .79 B. -.79 C. -.97 D. .97
Which is not an effective strategy for increasing the effectiveness of homework?
a. Select an appropriate cooperative learning format b. Adjust the amount of homework c. Establish and follow homework routines d. Teach study and organizational skills
______ variables measure gradational differences.
A. Continuous B. Independent C. Dependent D. Confounding
Refer to Exhibit 10-1. In order to test her hypothesis the teacher should have which group receive vocabulary instruction?
a. Those who volunteer b. The best students c. The poorest students d. A randomly selected group e. Good students who show poor concentration