Sampling bias would most likely not be a problem in which of the following situations?
a. A purposive sampling design was used to select the subjects.
b. Volunteers are recruited to serve as subjects.
c. Randomization was used to assign subjects to experimental and control groups.
d. Subjects who differ in the independent variable are also different in other important aspects.
C
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Although more costly in the long run, early intervention programs are also more effective
Indicate whether the statement is true or false.
What is self-complexity?
A. defining oneself in multiple different ways B. understanding that one has multiple motivations C. having friends with multiple different interests D. changing one's behaviors depending on a situation
Vocabulary can be taught explicitly, through the use of context clues, or
A) expressively. B) incidentally. C) singularly. D) progressively.
What is the unit of analysis for the NCES school research example in Chapter 8?
a. children b. classrooms c. schools d. teachers