In order to estimate the number of hours a day the typical student studies at his university, Paul interviews 25 randomly selected pre-med students. Paul has most likely violated which requirement for probability sampling plans?
a. stability in the samples
b. unbiased sample values
c. inadequate sample size
d. the use of random selection
b
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What kind of reactions are schema reflecting an infant's repetition of interesting or enjoyable actions that focus on the infant's own body?
A. primary circular reactions B. circular reactions C. secondary circular reactions D. tertiary circular reactions
Marcel has been diagnosed as having autism. According to various researchers, Marcel may have difficulty acquiring all but which of the following?
a. A theory of mind c. The ability to disengage attention b. Language d. Sensorimotor skills
Joanna, a child born with the genetic condition PKU, may suffer mental retardation unless
a. the child undergoes gene therapy. b. the child is given drug therapy. c. the child's diet is restricted to eliminate phenylalanine. d. the child's diet is restricted to eliminate ribonucleic acid.
According to Figure 9.7 The Changing Structure of American Families and Households , in 2007, the approximate percent of married couples with children was _____, and the approximate percent of married couples without children was _____.
a. · 15 percent; 45 percent b. · 22.5 percent; 28.3 percent c. · 50 percent; 75 percent d. · 75 percent; 50 percent