Econ 120 b pract midterm answers

# Econ 120 b pract midterm answers - Economics 120B Spring...

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Economics 120B Spring 2008 Dr. Maria Cândido PART I: Multiple-Choice Questions (2 points each, 24 points total) 1) In 2006-2007, the mean annual cost to attend a private university was \$21,180. Assume that the distribution of annual costs is normal and that the standard deviation is \$4,500. 97.5 % of all students at private universities pay less than what amount? a. \$28,560 b. \$30,000 c. \$32,790 d. Not enough information to compute. 2) A group of college students believes that herbal tea has remarkable restorative powers. To test its theory, the group makes weekly visits to a local nursing home, visiting with residents, talking with them and serving them herbal tea. After several months, many of the residents are more cheerful and healthy. Which of the following may be correctly concluded from this study? a. herbal tea does improve one’s emotional state, at least for the residents of nursing homes. b. there is some evidence that herbal tea may improve one’s emotional state. The results would be completely convincing if a scientist had conducted the study rather than a group of college students. c. the results of the study are not convincing since only a local nursing home was used and only for a few months. d. the results of the study are not convincing since the effect of herbal tea is confounded with several other factors. 3) In a sample, each 445 college students was classified according to number of cigarettes smoked per month (Y) and parental use of tobacco (X, where X=0 if neither parent is a smoker, X=1 if only one parent is a smoker and X=2 if both parents are smokers). The table below shows the joint probability distribution of X and Y. Joint Distribution of X and Y
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## This note was uploaded on 03/21/2009 for the course ECON 120B taught by Professor Jeon during the Fall '08 term at UCSD.

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Econ 120 b pract midterm answers - Economics 120B Spring...

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