ec41f10_hw1_solc

ec41f10_hw1_solc - Kata Bognar [email protected] Economics...

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Kata Bognar [email protected] Economics 41 Statistics for Economists UCLA Fall 2010 Homework Assignment 1. - suggested solutions by Minji Kang - Basics. 1. In statistics, conducting a census means: C (a) making decisions based on sample results (b) checking if a variable is discrete or continuous (c) collecting information from all members of the population (d) collecting a sample without replacement 2. A variable is a: B Frequency distributions and descriptive measures. 3. In a frequency distribution, the classes should always: D 4. A survey on hand hygiene reports how many times people say they wash their hands per day Number of times % of responses more than 10 36% 7-10 24% 5-6 23% 3-4 12% 1-2 2% According to this data, what is the proportion of people who wash their hands at least seven times per day? D 5. The ages of five employees of a company are 47, 28, 55, 31, and 52 years. Find: (a) i x i = 47 + 28 + 55 + 31 + 52 = 213 (b) i ( x i - 10) = 37 + 18 + 45 + 21 + 42 = 163 (c) ( i x i ) 2 = 213 2 = 45369 1
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(d) i x 2 i = 47 2 + 28 2 + 55 2 + 31 2 + 52 2 = 9683 6. The following is a list of miles per gallon for 15 different pick up trucks.
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