3818Exam1Practice

# 3818Exam1Practice - Name Date Use the following to answer...

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Name: __________________________ Date: _____________ Use the following to answer questions 1-3: During the early part of the 1994 baseball season, many sports fans and baseball players noticed that the number of home runs being hit seemed to be unusually large. Below are the team-by- team statistics on home runs hit through Friday, June 3, 1994 (from the Columbus Dispatch Sports Section, Sunday, June 5, 1994). They are given as separate stemplots for the number of home runs by American and National League teams. 1. The median for the number of home runs hit through Friday, June 3, 1994 for the American League teams is A) lower than for the National League teams. B) 45. C) 50. D) 57.5. 2. The mean of the number of home runs hit through Friday, June 3, 1994 by National League teams A) is 48.62. B) is 50.14. C) is 51.50. D) cannot be determined from the information given. 3. The five-number summary of the number of home runs hit through Friday, June 3, 1994 by National League teams is A) 35, 49, 57.5, 68, 77. B) 35, 50, 57.5, 68, 77. C) 35, 50, 57.5, 66, 77. D) 35, 49, 57.5, 66, 77. Page 1

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Use the following to answer questions 4-7: A sample of five exam scores yielded the following results: 77 84 81 70 66 4. The mean of the five scores is: A) 76.5. B) 75.6. C) 77. D) none of these. 5. The median of the five scores is: A) 77. B) 80. C) 76. D) 81. 6. The standard deviation of the five scores is: A) 56.3. B) 7.50. C) 0. D) 3169.7. 7. Suppose a mistake was made in recording the first score listed. It should have been an 87 rather than a 77. Which of the following can you conclude? A) The new mean would be unaffected because it is a measure of exact center. B) The new median would be unaffected because it is a measure of exact center. C) The new median would increase by 10. D) The new mean would increase by 10. Use the following to answer questions 8-9: The distribution of actual weights of 8.0 oz. chocolate bars produced by a certain machine is normal with a mean of 8.1 oz. and a standard deviation of 0.1 oz. 8. The proportion of chocolate bars weighing under 8.0 oz. is A) 0.500. B) 0.159. C) 0.341. D) 0.841. Page 2
9. The proportion of chocolate bars with weights between 8.2 and 8.3 oz. is A) 0.819. B) 0.636. C) 0.477. D) 0.136. 10. John scores 620 on the math portion of the SAT. The distribution of SAT math scores in 2004 was normal with a mean of 510 and standard deviation of 110. Alison takes the ACT math test and scores 25. ACT math scores in 2004 were normally distributed with a mean of 21 and standard deviation 5.0. Assuming that both tests measure the same kind of ability, who has the higher score?

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## This test prep was uploaded on 03/31/2008 for the course ECON 3818 taught by Professor Jessvechibany during the Spring '07 term at Colorado.

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3818Exam1Practice - Name Date Use the following to answer...

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