MasterQuiz1

MasterQuiz1 - Chapter 1 1 A five number summary for hours...

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Chapter 1 1. A five number summary for hours studied in a week were 5, 12, 14, 18, and 20. What is the value such that 25% of the students studied longer than that value? A. 20 hours B. 18 hours C. 12 hours D. 14 hours E. 5 hours The third quartile, Q3, splits the distribution from 75% at/below and 25% at/above. So 18 would be the answer. Points Earned: 1/1 Correct Answer: B Your Response: B 2. Ultrasound is a procedure used by physicians to examine the fetus of a pregnant woman. An observational study found that the average birthweight of infants whose mothers who had used ultrasound was lower than the average birthweight of infants whose mothers had not. The most likely confounding variable for this study was A. women having problems with their pregnancies were more likely to choose an ultrasound than women without pregnancy problems. B. the number of women having ultrasounds was different than the number of women not having ultrasounds. C. women in the group who had ultrasound slept more than women in the group without ultrasound. D. there were no confounding variables: each infant could be assigned to one of two groups: the group whose mothers had or did not have ultrasound.

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Pregnancy problems would be the most likely confounding variable. Points Earned: 1/1 Correct Answer: A Your Response: A 3. Which of the following is not a component of "Statistics" as defined in Chapter 1? A. Procedures and principles for gathering data B. Procedures and principles for making decisions when faced with uncertainty C. Procedures and principles for analyzing data and information D. Procedures and principles for turning uncertainty into certainty Even statistics cannot turn an uncertainty into a certainty! ---although statistics can present a clearer picture of what is going on. Points Earned:
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This note was uploaded on 12/06/2009 for the course STAT 200 at Penn State.

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MasterQuiz1 - Chapter 1 1 A five number summary for hours...

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