exam3ab - Exam 3, Biology 301D, 14 November 2001 Printed...

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Exam 3, Biology 301D, 14 November 2001 Printed name ________________ (2pts) Social security number and name . Bubble in the scantron with your name and your social security number (your SSN goes(in the first 9 bubbles of the scantron ID field). (For good measure, put your name on this hard copy too, in case your key code does not carry over.) (2pts) Key Code : One of the exam questions will indicate a key code. Make sure you fill those in as indicated on the question indicated. When finished , turn in both the Scantron and hard copy. You may write on this hard copy, but your grade will be determined by the Scantron form . None, one, all, or any combination of individual answers may apply to a question unless stated otherwise .
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1. (5 points) Which of the following constitutes an example of inferring causation from correlation (i.e., a correlation leads someone to infer the causal basis of the correlation)? Base your answer only on the information provided. Do not circle answers that merely describe a correlation or which infer correlation from causation (the reverse of what we want). (A) You bring your “perfect partner” home to meet your parents for the first time, telling them of your engagement to get married. Your parents find out that the parents of your partner are divorced and object to your marrying this person because it has been shown that children whose parents are divorced also have high divorce rates, and your parents are thus worried that marrying this partner will end in divorce. (B) In the 1970s it was noted that prison populations contained an unusually high incidence of men with two Y chromosomes (they also had an X), in contrast to their low incidence in the non-prison population. Thus, the XYY genotype was over-represented in criminals. (C) A person is more apt to make mistakes when they are sleepy than when they have had adequate sleep because the lack of sleep impairs judgment. As a consequence, sleepy drivers are involved in auto accidents more often than are awake drivers. (D) Studies have documented that people with high-fat diets have higher cancer rates than people with low-fat diets. (E) Studies have documented that people who consume low amounts of alcohol have low levels of heart disease compared to people who do not drink at all. You thus encourage your parents (who have traditionally been non-drinkers) to start consuming 1-2 ounces of alcohol a day. 2. (5 pts ) You observe a correlation between levels of tooth decay and the amount of junk food a person eats (more tooth decay with higher amounts of junk food). Which of the following models are consistent with this observation? (A) Junk food causes higher levels of tooth decay. (B) Bad teeth cause a person to eat more junk food.
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exam3ab - Exam 3, Biology 301D, 14 November 2001 Printed...

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