5) The response variab le is cust oner satisfection. What type of variable is cu
ID: 3159986 • Letter: 5
Question
5) The response variab le is cust oner satisfection. What type of variable is customes 5) atinfaction A) Customer satisfaction is categorical (qualitative) variable. B) Customer satisfaction is a discrete (quantitative) variable C) Customer satisfaction is a continaous (quantitative) variable. D) Customer satisfaction is a discrete and continuous variable. QUESTION 6 The costs (in dollars) of 10 college math textbooks are listed below $70 $ 72 $71 $70 $69 3 $69 $68 $0 $71 6) Find the sample standard deviation. B) $1.40 C) $1.49 D) $2.23 A) $2.00 QUESTIONS 7-8: Consider the data set below: round-trip commuting times (in minutes) of 20 randomly selected employees 135 120 115 132 136 124 119 145 98 110 125 120 115 130 140 105 116121 125 108 below 136 105 115 130 7) Describe the shape of the histogram A) symmetric C) uniform B) skewed to the left D) skewed to the right 5) 8) The center of the distribution should be estimated using which statistic? A) Mean C) Standard deviation B) Median D) Variance QUESTION 9: Provide an appropriate response. 9) All of the following are affected by outliers EXCEPT A) Standard deviation C) Correlation B) Mean D) MedianExplanation / Answer
5.
Customer satisfaction is a rating, and it only takes up some values (integers). Hence, it is discrete, so
OPTION B. [ANSWER]
[Note: Some may argue that it is OPTION A: categorical, as it doesn't make sense to add/subtract satisfaction ratings. However, some do average the ratings, treating it as quantitative. Please select which options suits in your class. Thanks!]
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6.
Getting the mean, X,
X = Sum(x) / n
Summing the items, Sum(x) = 703
As n = 10
Thus,
X = 70.3
Setting up tables,
x x - X (x - X)^2
70 -0.3 0.09
72 1.7 2.89
71 0.7 0.49
70 -0.3 0.09
69 -1.3 1.69
73 2.7 7.29
69 -1.3 1.69
68 -2.3 5.29
70 -0.3 0.09
71 0.7 0.49
Thus, Sum(x - X)^2 = 20.1
Thus, as
s^2 = Sum(x - X)^2 / (n - 1)
As n = 10
s^2 = 2.233333333
Thus,
s = 1.494434118 = 1.49 [ANSWER, C]
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