1 point for taking the quiz
STAT 226, Section A—Quiz 1 (4 pts.)
According to the Recording Industry Association of America, sales of recordings in the United States were about $7 billion in 1990. Here is data on the
sales (in billions of dollars) of the most popular genders of of music sold that
year:
Rock 2.8 Jazz 0.4
Rap 1.4
Classical 0.3 Pop 1.0 Country 0.7
1. (2 pts.) Present these data on a correctly labeled Pareto chart.
See Figure 1 (a).
2. (1 pt.) Present these data using a pie chart. Don’t forget to label it!!
The information provided on the sales for the most popular kinds of music
adds up to only 6.6 billions, which is less than the total given in the
statement of the problem (about 7 billions). We can draw the pie chart
only if we have the information about all the categories. In this case,
we could say that all other categories can be summed up in one additional category, say ”Other”. If we do so, the pie chart would look like
the graph in Figure 1 (b).
DataQuiz1: Chart by Type
Chart
DataQuiz2: Chart of Sales (bilions) by Kind
(a)
Chart
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Freq: sales
(b)
4
4.3%
10.0%
5.7%
40.0%
2.8
5.7%
N
Sales (bilions)
3
2
14.3%
1.4
1
1
20.0%
0.7
0.4
0.3
Type
6Classical
5Jazz
4Country
3Pop
2Rap
1Rock
0
Type
Classical
Country
Jazz
Pop
Rap
Rock
Kind
Kind
Figure 3Pop
1: Graphical displays of the data
1Rock
2Rap
4Country
5Jazz
6Classical
Other
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