In addition to holding all conditions of an experiment constant, what is another control
method that a researcher could use to minimize the potential presence of extraneous
variables?
A) Use a within-subjects design
B) Use treatment or control groups
C) Use several independent variables
D) Use more participants in the experiment
B
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The newborn's brain and body grow mostly during __________.
A. waking hours B. play activities C. REM sleep D. NREM sleep
Whiting and Edwards's (1988) study examining gender roles in 12 traditional cultures found that about 30% to 40% of 2- to 3-year-olds were in same-gender play groups but __________ of 8- to 11-year olds were in gender-specific play groups.
A. about 10% B. remained the same at 30-40% C. about 70% D. more than 90%
People with schizophrenia appear to __________ than other people.
A. produce more estrogen B. produce less epinephrine C. have more irregularities in the use of dopamine D. excrete more dopamine in the urine
Which of the following is NOT a type of prelinguistic speech?
A. Gestures B. Babbling C. Cooing D. Crying