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Assignment+3 HOMEWORK EPI

Assignment+3 HOMEWORK EPI - gezmu_sp2011 Jennipher Ventura...

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gezmu_sp2011 Jennipher Ventura Assignment 3 ANSWER QUESTIONS 1 and 2 BASED ON THE FOLLOWING INFORMATION: Statistics professor has just given a final examination in his statistical inference course. He is particularly interested in learning how his class of 40 students performed on this exam. The scores are shown below. 75 79 72 75 77 71 78 83 84 71 81 82 79 71 73 89 74 75 93 74 88 83 90 82 79 62 73 88 76 76 80 76 84 84 80 68 74 76 70 91 1. What are the mean and median scores on this exam? ANSWER: Mean= 78.4 Median=77.5 2. Explain why the mean and median are different. ANSWER: Mean- deals with the average number while the median deals with the most accurate number (middle number) QUESTIONS 3 and 4 ARE BASED ON THE FOLLOWING INFORMATION: The average time in minutes, for a sample of 40 people living in Detroit metropolitan area to travel to work and back home each day is shown below. 42.8 47.1 46.3 42.2 55.9 35.0 41.4 37.8 33.9 36.6 51.8 43.1 51.5 45.5 40.7 57.6 36.5 32.3 41.9 37.0 41.3 32.6 34.1 31.9 42.9 48.5 46.7 40.9 46.6 29.5 61.5 36.5 48.9 40.6 48.1 39.8 35.6 44.4 38.6 45.6 3. Find the most representative average commute time. ANSWER: The most representative average commute time is more than 41 minutes for the Detroit metropolitan area travel to work and back home each day. 4. Does it appear that the distribution of average commute time is approximately symmetric? Explain why or why not.
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gezmu_sp2011 ANSWER: The distribution is slightly skewed to the right; it is essentially not symmetric. The mean
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