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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 Spring '11
 tefera
 Standard Deviation, Mean, Count Mean Median

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