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Unformatted text preview: Kata Bognar firstname.lastname@example.org Economics 41 Statistics for Economists UCLA Spring 2010 Midterm 1 - Version A- answer key by Ziyan Huang - Part I - Multiple Choice Questions (3 points each) 1. A scientist is conducting an experiment to determine the relationship between consumption of a certain type of food and high-blood pressure. He conducts a random sample on 2,000 people and first asks them a yes or no question: Do you eat this type of food more than once a week? He also takes the blood pressure of each person and records it (example: 120/80). Which one of the following statements is true? (a) The blood-pressure data is quantitative data. (b) The data regarding whether each person eats the food regularly is quantitative data. (c) The population is all U.S. males. (d) The sample is the same as the population. Solution: a) 2. You have decided to construct a pie chart to represent the music preferences of 80 people entering a record store. Thirty of the people said that they like hip-hop. In completing the chart, what angle size should the class hip-hop have? (a) 67.5 degrees (b) 90.0 degrees (c) 135.0 degrees (d) 180.0 degrees Solution: c) 3. The mean is larger than the median when (a) the data is left-skewed (b) the data is symmetric (c) the data is composed of positive numbers (d) none of the above Solution: d) 4. The commuting time (in minutes) from home to work for a sample of five persons is 47, 53, 28, 31, and 16. The mean calculated for these data is a(n): (a) frequency (b) relative frequency (c) parameter (d) statistic Solution: d) 5. The value of the third quartile for a data set is 45. This means that: (a) 60% of the values in that data set are smaller than 45 (b) 75% of the values in that data set are smaller than 45 (c) 75% of the values in that data set are greater than 45 (d) 60% of the values in that data set are greater than 45 Solution: b) 1 6. A pair of fair dice are tossed simultaneously. We are interested in the sum of the numbers showing on the dice. The number 8 is a(n) (a) event (b) outcome (c) simple event (d) all of the above...
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