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mat126 week5 quiz - Student Gradebook Exam Page 1 of 7...

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Grading Summary These are the automatically computed results of your exam. Grades for essay questions, and comments from your instructor, are in the "Details" section below. Date Taken: 8/23/2011 Time Spent: 7 h , 11 min , 25 secs Points Received: 18 / 20 (90%) Question Type: # Of Questions: # Correct: Multiple Choice 20 18 Grade Details 1. Question : Find the median. 2 27 38 55 49 9 53 34 Student Answer: 38 g25 g24 g23 g22 g21 g20 36 g25 g24 g23 g22 g21 g20 49 g25 g24 g23 g22 g21 g20 52 g25 g24 g23 g22 g21 g20 Instructor Explanation: See section 12.3 of the textbook. Points Received: 1 of 1 Comments: 2. Question : Armia's percentile rank on an exam in a class of 300 is 85. Sanjo's class rank is 42. Who is ranked higher? Student Answer: Armia g25 g24 g23 g22 g21 g20 Sanjo g25 g24 g23 g22 g21 g20 Instructor Explanation: See section 12.5 of the textbook. Points Received: 0 of 1 Comments: 3. Question : A data set of size 19 has correlation coefficient of r = –0.432. Test the significance of r at the 5% level and at the 1% level. Student Answer: r is significant at 5% and at 1%. g25 g24 g23 g22 g21 g20 r is significant at 5%, but not at 1%. g25 g24 g23 g22 g21 g20 r is is not significant at 5% or at 1%. g25 g24 g23 g22 g21 g20 Instructor Explanation: See section 12.8 of the textbook. Points Received: 1 of 1 Comments: Page 1 of 7 Student Gradebook Exam 8/31/2011 https://takeexam.next.ecollege.com/(NEXT(a0e2b60cfb))/Main/CourseMode/StudentGrad...
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4. Question : Find the median and the mean for the data set below. 5.4 2.0 6.8 3.1 2.9 4.7 2.1 5.0 1.9 3.4 Student Answer: mean = 37.3; median = 3.25 g25 g24 g23 g22 g21 g20 mean = 3.73; median = 3.4 g25 g24 g23 g22 g21 g20 mean =37.3; median = 3.4 g25 g24 g23 g22 g21 g20 mean = 3.73; median = 3.25 g25 g24 g23 g22 g21 g20 Instructor Explanation: See section 12.3 of the textbook. Points Received: 1 of 1 Comments: 5. Question : Which of the following is not a property of a normal distribution? Student Answer: It never touches the x -axis. g25 g24 g23 g22 g21 g20 It is continuous. g25 g24 g23 g22 g21 g20 The mean, median, and mode are equal. g25 g24 g23 g22 g21 g20 It is bimodal (i.e., it has two modes). g25 g24 g23 g22 g21 g20
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