Practice Problems Ch. 1: 12, 15, 19, 20, 21, & 22
12. Explain and give an example for each of the following types of variables: (a) equal
interval, (b) rankorder, (c) nominal, (d) ratio scale, (e) continuous.
a)
EqualInterval: Counting of years because different cultures have different starting points
b)
RankOrder: Standings in Professional Sports
c)
Nominal : Political party people vote for
d)
Ratio Scale: Weight of People and Length of an object
e)
Continuous: Weight of People and TimeLengths
15. Following are the speeds of 40 cars clocked by radar on a particular road in a
35mph zone on a particular afternoon:
30, 36, 42, 36, 30, 52, 36, 34, 36, 33, 30, 32, 35, 32, 37, 34, 36, 31, 35, 20,
24, 46, 23, 31, 32, 45, 34, 37, 28, 40, 34, 38, 40, 52, 31, 33, 15, 27, 36, 40
Make (a) a frequency table and (b) a histogram. Then (c) describe the general shape of
the distribution
a)
A frequency table
Value Frequency
15
1
16
0
17
0
18
0
19
0
20
1
21
0
22
0
23
1
24
1
25
0
26
0
27
1
28
1
29
0
30
3
31
3
32
3
33
2
34
4
35
2
36
6
37
2
38
1
39
0
40
3
41
0
42
1
43
0
44
0
45
1
46
1
47
0
48
0
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49
0
50
0
51
0
52
2
b) A histogram
c) Describe the general shape of the distribution
The general shape is approximately bell shaped. Notice how we can draw a bell shaped curve
over the histogram like so and notice how the shape of the histogram fits that curve.
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 Spring '11
 TIFFANYCRON
 Frequency, Frequency distribution, Histogram, frequency table

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