If one is planning to use multiple regression to summarize how the variables X1, X2, X3 explain the variation in Y, how many parameters are involved in estimating the linear regression?
A. 2
B. 3
C. 4
D. 5
Answer: C
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Fingerprint pattern is inherited, but also affected by the environment. An example of how the environment naturally can alter fingerprint pattern is
A) a criminal taking off the fingertip skin with acid. B) a fetus touching the developing toe and finger pads to the wall of the amniotic sac. C) a person developing skin disorders. D) the fingertips rubbing away from too much computer use.
Which of the following is a proximate question in regards to animal behavior?
A. How does a male songbird learn the songs that attract females of his species? B. When does a human male develop a deep voice? C. Why does a gazelle leap to warn others in the herd when a predator is present? D. Why do parents risk their lives for those of their offspring? E. Why do crows work together to attack great horned owls?
Which of the following statements is (are) correct about an oxidation-reduction (or redox) reaction?
A) The molecule that is reduced gains electrons. B) The molecule that is oxidized loses electrons. C) The molecule that is reduced loses electrons. D) The molecule that is oxidized gains electrons. E) Both A and B are correct.
Which of the following is not a reason the skin is a useful barrier?
A) The skin is enriched with antimicrobial peptides. B) The skin is enriched with lipids to serve as a water-resistant layer. C) The skin produces mucus to trap microbes. D) The outermost layer is made up of tightly compacted dead epithelial cells. E) The skin is enriched with specialized proteins such as keratin.