Which of the following variables might be a proxy variable for the confounding factor of cognitive ability in a sample of workers and their ability to generate sales?

A. Age
B. Tenure at the company
C. Test scores
D. Past sales records


Answer: C

Biology & Microbiology

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Egg laying is a character unique to which groups of animals and their ancestors?

A. birds B. mammals C. reptiles D. All of the answer options are correct.

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Clues from geology and paleontology suggest that simple cells, or their precursors, arose about _____ years ago.

A. 6 million B. 4 billion C. 2 billion D. 1 million E. 3 million

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The microtubules that form the mitotic spindle extend out from the centrosome. Where would you expect to find the plus (fast assembling) end of a spindle microtubule?

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Suppose your mother has albinism, which is a recessive trait. Suppose also that your father has cystic fibrosis, which is also caused by a recessive trait. And, you learn that your father-in-law has albinism and cystic fibrosis. What are the odds that your first child will have both albinism and cystic fibrosis?

a. 1 in 2 b. 1 in 4 c. 1 in 8 d. 1 in 16

Biology & Microbiology