Dr. Kelly is studying the effects of time constraint on performance. She is studying men and women of various ages. What is the independent variable in this study?
A. performance
B. time constraint
C. gender
D. age
Answer: B
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Which of these periods of prenatal development is shortest, covering the fewest days?
a. Fetal period b. Embryonic period c. Period of the zygote d. All are of equal duration
A child is playing with plastic models of cows and horses on a toy farm. She takes some of the animals out of the field and places them in the barn exclaiming, "Oh my! Now the field is much bigger."
The child's perception is characteristic of the ______ stage. a. sensory-motor c. concrete operational b. preoperational d. formal operational
Korean toddlers often develop object-sorting skills later than their English-speaking counterparts because
A) Korean adults rarely call babies' attention to commonalities among objects. B) the Korean language often omits object names from sentences. C) Korean parents discourage babies from exploring objects. D) English-speaking adults have better categorization skills than their Korean-speaking counterparts.
Which outcome is a disadvantage of a longitudinal research design?
A. Individuals of different ages are being compared to one another. B. Longitudinal samples cannot be representative of the overall population. C. Longitudinal studies fail to track changes over time. D. Research participants may drop out due to moving, loss of interest, or death.