# ps1 - Econ 41 Statistics for Economists Summer 2007...

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1 Econ 41 Statistics for Economists Summer 2007 Chunming Yuan Problem Set 1 MULTIPLE CHOICE Chapter 1: 1. In statistics, a population consists of: a. all people living in a country b. all people living in the area under study c. all subjects or objects whose characteristics are being studied d. a selection of a limited number of elements 2. In statistics, a representative sample is the sample that: a. contains the characteristics of the population as closely as possible b. represents the results of a sample exactly c. contains all people living in an area d. contains elements collected with replacement 3. Time-series data are collected: a. on the same element for the same variable for different periods of time b. on a variable that involves time, e.g., minutes, hours, weeks, months, etc. c. for a qualitative variable d. on different elements for the same period of time 4. Which one of the following is an example of cross-section data? a. daily checking account balance last year b. total insect population among 12 U.S. national parks in 2003 c. consumption (in pounds) of pork products in the U.S. from 1983 to 2003 d. total value of U.S. Savings Bonds each year from 1994 to 2004 Chapter 2: 5. A distribution curve that is right-skewed has: a. both tails of the same length b. a longer tail on the left side c. a shorter tail on the right side d. a longer tail on the right side Use the following information for questions 6 – 15:

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2 The following table gives the frequency distribution of scores for a mathematics class of 30
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## ps1 - Econ 41 Statistics for Economists Summer 2007...

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