Intelligence tests are constructed so that IQ scores
A) are an unbiased estimate of the population variance.
B) approximate a binomial distribution.
C) are distributed according to a normal curve.
D) are statistically independent from one another.
C
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In the United States currently, in large part because of insurance companies, the average hospital stay for a normal birth is how many days?
A. 2 B. 4 C. 7 D. 9
After years of extensive use, the Gesell scale
a. still has a number of problems. b. has relatively few problems. c. is no longer used in clinical settings. d. has excellent documentation in terms of reliability and validity.
If we run a chi-square test on a one-way classification, a significant result tells us that
a. science has triumphed over evil. b. the categories are evenly represented in the data. c. the frequencies differ by category. d. we have made an error.
Researchers who have replicated Piaget's basic observations of the development of object permanence have typically done which of the following?
a. used only-small-scale studies b. used the same procedures as Piaget did c. used greater experimental control than Piaget did d. studied infants with a smaller age-range than Piaget did