Researchers have studied claims that educationally oriented DVDs can enhance development of language in young infants. The research results have shown that
a. exposure to the DVDs actually led to slower language development than if the infants did not watch the DVDs.
b. the effect is strongest if the infant is introduced to the DVDs as early as the infant can pay attention to them.
c. it is difficult to get conclusive results because it is nearly impossible to study infants systematically.
d. the greater the exposure to the DVDs, the greater the language development in the infants.
Question 2
Typically, __________ research designs are more convenient and efficient relative to __________ designs.
a. between-subjects; within-subjects
b. within-subjects; between-subjects
c. between-subjects; repeated measures
d. within-subjects; repeated measures
Bronfenbrenner’s model of the ecological-systems approach to studying development. He suggested that
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