The combined variance for two samples weighted by the sample size of each sample refers to what?
A. sample means
B. pooled variance
C. pooled means
D. sample variance
Answer: B
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If you score in the upper quartile,
a. you scored in the 25th percentile or higher. b. you scored in the 75th percentile or higher. c. you scored better than 1/4 of all people d. you scored better than 40% of all people.
Which of the following is NOT a major claim of Darwin's theory of evolution?
a. There is genetic variation in a species. b. Some genes aid in adaptation to the environment more than other genes do. c. New species emerge on their own and are not related to earlier species. d. Genes that aid in adaptation to the environment are more likely to be passed on to future generations.
To determine a child's competencies, it is useful to have some knowledge of ____
a. institutional norms b. animal behavior c. adult dysfunctions d. developmental tasks
Musicians, who practice special motor skills throughout their lives, have a larger than average
a. pons. b. limbic system. c. cerebellum. d. thalamus.