Based on adoption and twin studies, what do researchers conclude about the influence of genetics and environment on the development of intelligence?
a) Fraternal twins’ IQ correlation is equal to the IQ correlation of biological siblings.
b) Adopted children have IQs closer to that of their adoptive parents.
c) Identical twins have the highest IQ correlation.
d) Adopted siblings have IQs similar to that of their adopted siblings raised in the same home.
Answer: c
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In a rapid serial visual presentation of a set of numbers or letters (one at a time), there is a tendency to "miss" any repeated letter, especially if there are only one or two intervening items. This reflects __________
a. repetition blindness b. span of apprehension c. apperceptive agnosia d. partial report
A two-tailed test is associated with
A) the research hypothesis. B) the null hypothesis. C) anondirectional hypothesis. D) a directional hypothesis.