Because the participants who drop out of a longitudinal study are likely to be different in some ways from those who remain until the end of the study
A. the conclusions drawn from longitudinal studies are seldom reliable.
B. the sample that is initially representative becomes increasingly biased over time.
C. there will be a cohort effect upon the final results.
D. attrition will make the sample more representative over time.
Answer: B
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A. increase B. decline C. steady rate
Refer to Exhibit 7-7. What is the F value for the Interaction?
a. .006 c. 9.864 b. .162 d. None of these are true.
Multiply controlled behaviors occur when:
a. one inappropriate behavior is punished and another inappropriate behavior is displayed b. one behavior has more than one outcome or intent c. one behavior is controlled by multiple antecedents d. one behavior is reinforced and punished simultaneously
Prospects of health care and education are promising for people with disabilities in developing countries
Indicate whether the statement is true or false.