Loss of subjects is a threat to internal validity because:
A. it reduces the size of the sample.
B. it reduces the power of statistical tests of significance.
C. it means that the results of the study are less generalizable.
D. those lost may differ on the dependent variable from the remainder.
Answer: D
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?Although we know that developing units is the work of districts, schools, and teachers,standardized tests often drive ______________________.
Fill in the blank(s) with the appropriate word(s).
Ms. Yang is planning to rearrange her classroom in preparation for a new unit in which her students will be working in small groups on projects for the upcoming science fair. Which of the following classroom arrangements is least suitable?
A. Face-to-face style B. Offset style C. Seminar style D. Cluster style
A key characteristic that differentiates quasi-experiments from strong experiments is:
a. The lack of a control group b. The lack of a pretest c. The lack of random assignment d. The lack of a posttest
Answer the following statement(s) true (T) or false (F)
The estimation formula for the two-independent-sample t is M1 – M2 ± t(sMD).