Natural (or quasi-) experiments differ from real experiments in the sense that
a. the IV is selected but not manipulated or controlled.
b. both variables are IVs.
c. experimental control is strengthened.
d. causes of behaviors are identified more clearly.
A
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According to Thomas and Chess, who conducted a large-scale study of infants in the New York Longitudinal Study, what percentage of children were found to be "slow-to-warm babies"?
A. 10 percent B. 25 percent C. 15 percent D. 5 percent
A normal distribution has ? = 80 and ? = 10 . What is the probability of randomly selecting a score greater than 90 from this distribution?
a. 0.8413 c. 0.3085 b. 0.1587 d. 0.6915
Six-month old Hanna is in the _____ stage of cognitive development, whereas her 5-year-old brother is likely in the _____ stage
a) preoperational; concrete operations b) sensorimotor; preoperational c) formal operations; sensorimotor d) concrete operations; concrete operations
A correlation of .00 indicates that __________.
A. you made a mistake in your calculation B. you did not find out anything about the relationship between the two variables C. the two variables are unrelated D. everyone who scored low on one variable scored high on the other variable, and vice versa