Statistics Special Exam Opener (new edition)

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Look at the following data and see if you can identify any outliers: 89 9 94 55 63 77 4 70 83 61 345 65 69 94, 4, 70 -6.0 points Instructor Comments You can see the correct outliers in the answer... key. Answer Key Look at the following data and see if you can identify any outliers: 89 9 94 55 63 77 4 70 83 61 345 65 69 The outliers are: 4 9 345 Exam Page 2 Consider the following set of data: {25, 22, 14, 35, 44, 8, 18, 30, 44} a) Find the median. 25 b) Find the mode of this set. 44 Instructor Comments Very good. Answer Key Consider the following set of data: {25, 22, 14, 35, 44, 8, 18, 30, 44} a) Find the median. a) In order to find the median, we must first put the numbers in ascending order: 8, 14, 18, 22, 25, 30, 35, 44, 44. Notice that the “middle” number is 25. So, Median = 25. b) Find the mode of this set. b) The number that occurs most is 44. So, the mode is 44. Exam Page 3 Suppose A and B are two events with probabilities: P(A)=.70,P(B^c )=.75,P(A∩B)=.20. Find the following: a) P(A∪B). P(A∪B)=P(A)+P(B)-P(AnB)=.7+.75-(.7)(.75)=.20 P(A∪B)=P(A)+P(B)-P(AnB)=.7+.75-.525=.20 P(A∪B)=P(A)+P(B)-P(AnB)=.7+.75-.525=.20 P(A∪B)=P(A)+P(B)-P(AnB)=1.45-.525=.20 P(A∪B)=P(A)+P(B)-P(AnB)=.925=.20 P(A∪B)=P(A)+P(B)-P(AnB)=.20 .925 P(A∪B)=.216 b) P(Ac). P(Ac)=1-P(A)+1-(.70)=0.3 c) P(B). [Show More]

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