Depending on the drug, what percentage of multiple births results from using fertility drugs?
a. 1–2%
b. 10–25%
c. 40–55%
d. 60–75%
Answer: B
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Why do male birds with long tails seem attractive to females of many species? a. Long tails help the bird fly better
b. Long tails interfere with aggressive behavior. c. Long tails are positively correlated with health. d. Long tails are an indicator of youth.
Kristine wants to improve her running time. She is most likely to choose a reference group that
a. includes both inferior and superior runners, called self-esteem comparison. b. includes both inferior and superior runners, called social comparison. c. is limited to inferior runners, called downward social comparison. d. is limited to superior runners, called upward social comparison.
Dizygotic twins:
a. are also known as identical twins. b. share about one half of their genes. c. are more similar to each other than ordinary siblings. d. occur less frequently than monozygotic twins.
If a researcher reported for a one-tailed single-sample t test that t(14) = 2.25, then:
a. p < .025. b. p < .05. c. p < .01. d. p < .001.