1-20chapter stats

A 11415 b 118 c 148 d 45 e 1155 38 the local amusement

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Unformatted text preview: p watch to record the time they spent in line. The times recorded were as follows (in minutes): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118 What is the mode? A. 114.15 B. 118 C. 148 D. 45 E. 115.5 1-124 Chapter 01 - An Introduction to Business Statistics 40. Quality control is an important issue at ACME Company which manufactures light bulbs. In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted. 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the mean? A. 375 B. 368 C. 389.9 D. 200 E. 346.6 41. Quality control is an important issue at ACME Company which manufactures light bulbs. In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted. 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the median? A. 375 B. 368 C. 389.9 D. 200 E. 346.6 42. Quality control is an important issue at ACME Company which manufactures light bulbs. In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted. 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the mode? A. 375 B. 368 C. 389.9 D. 200 E. 346.6 1-125 Chapter 01 - An Introduction to Business Statistics 43. Find the coefficient of variation for IQ tests with a mean of 100 and a standard deviation of 15. A. 15.0 B. 6.7 C. 0.15 D. 1.5 E. 67 44. Find the z-score for an IQ test score of 142 when the mean is 100 and the standard deviation is 15. A. 42 B. 2.8 C. 18.78 D. 1.27 E. -2.8 45. Find the z-score for an IQ test score of 92 when the mean is 100 and the standard deviation is 15. A. 0.53 B. 0.77 C. -0.77 D. -0.53 E. -8.00 46. Find the z-score for an IQ test score of 118 when the mean is 100 and the standard deviation is 15. A. 1.2 B. 1.0 C. 18.0 D. -1.03 E. -1.2 1-126 Chapter 01 - An Introduction to Business Statistics 47. Find the z-score for an IQ test score of 125 when the mean is 100 and the standard deviation is 15. A. 25 B. 1.1 C. 1.67 D. -1.1 E. -1.67 48. Using Chebyshev's Rule, find the interval that contains at least 93.75% of all measurements when mean = 2.549 and s = 1.828. A. [-2.935 8.033] B. [-1.107 6.205] C. [-26.699 31.797] D. [2.435 2.663] E. [-4.763 9.861] 49. According to a survey of the top 10 employers in a major city in the Midwest, a worker spends an average of 413 minutes a day on the job. Suppose the standard deviation is 26.8 minutes and the time spent is approximately a normal distribution. What are the times that approximately 68.26% of all workers will fall? A. [394.8 431.2] B. [386.2 439.8] C. [372.8 453.2] D. [359.4 466.6] E. [332.6 493.4] 50. According to a survey of the top 10 employers in a major city in the Midwest, a worker spends an average of 413 minutes a day on the job. Suppose the standard deviation is 26.8 minutes and the time spent is approximately a normal distribution. What are the times that approximately 95.44% of all workers will fall? A. [387.5 438.5] B. [386.2 439.8] C. [372.8 453.2] D. [359.4 466.6] E. [332.6 493.4] 1-127 Chapter 01 - An Introduction to Business Statistics 51. According to a survey of the top 10 employers in a major city in the Midwest, a worker spends an average of 413 minutes a day on the job. Suppose the standard deviation is 26.8 minutes and the time spent is approximately a normal distribution. What are the times that approximately 99.73% of all workers will fall? A. [305.8 520.2] B. [386.2 439.8] C. [372.8 453.2] D. [359.4 466.6] E. [332.6 493.4] 52. According to Chebyshev's Theorem, at least what proportion of the data will be within for: k = 2 A. 68% B. 50% C. 25% D. 75% E. 34% 53. According to Chebyshev's Theorem, at least what proportion of the data will be within for: k = 2.5 A. 16% B. 40% C. 68% D. 60% E. 84% 54. According to Chebyshev's Theorem, at least what proportion of the data will be within for: k = 1.6 A. 39% B. 58% C. 68% D. 61% E. 92% 1-128 Chapter 01 - An Introduction to Business Statistics 55. According to Chebyshev's Theorem, at least what proportion of the data will be within for: k = 3.2 A. 90% B. 95% C. 84% D. 97% E. 10% 56. According to Chebyshev's theorem, how many standard deviations from the range would include at least 80% of the values? A. 5.0 B. 2.2 C. 2.5 D. 1.6 E. 2.0 57. In a statistic class, 10 scores were randomly selected with the following results were obtained (mean = 71.5): 74, 73, 77, 77, 71, 68, 65, 77, 67, 66 What is the range? A. 22.72 B. 12.00 C. 4.77 D. 516.20 E. 144.00 58. In a statistic class, 10 scores were randomly selected with the following results were obtained (mean = 71.5): 74, 73, 77, 77, 71, 68, 65, 77, 67, 66 What is the variance? A. 22.72 B. 12.00 C. 4.77 D. 516.20 E. 144.00 1-129 Chapter 01 - An Introduction to Business Statistics 59. In a statistic class, 10 scores were randomly selected with the following results were obtained (mean = 71.5): 74, 73, 77, 77, 71, 68, 65, 77, 67, 66 What is the standard deviation? A. 22.72 B. 12.00 C. 4....
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