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STT 315
Sample Problems for Quiz 3
Spring 2008
1. The wages of a random sample of National Bank black
female hourly workers are given in the following data set:
16015
17516
17274
16555
20788
19312
17124
18405
19090
12641
17813
18206
19338
15953
16904
18346
a) Find the first quartile, the median, the third quartile,
and the interquartile range for this set of data.
b) Draw a boxplot for the data. Are there any outliers? Is
the distribution of the data symmetric or skewed? If it is
skewed, to what side?
c) If we remove the value 12641 from the set of data, would
you say the distribution is symmetric or skewed?
2. Below is a random sample of the number of calls received
between 8 A.M. and 9 A.M. by a software developer’s
technical support line:
13
20
14
12
21
18
12
14
17
23
9
12
10
13
20
12
18
20
13
13
11
14
13
10
14
19
12
18
20
20
25
13
13
17
14
18
21
28
13
23
10
13
22
19
14
15
15
23
13
a) Finish the stemandleaf plot started below (I’ve done
the first row of the data set). The stem (the tens digit)
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 Spring '08
 Anderson

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