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2.2 Basic Statistical Descriptions of Data 55

6000

5000
Count of items sold 3000
4000

2000
1000
0
40–59 60–79 80–99 100–119 120–139
Unit price ($)

Figure 2.6 A histogram for the Table 2.1 data set.

700
600
Items sold 500
400
300
200
100
0
0 20 40 60 80 100 120 140
Unit price ($)

Figure 2.7 A scatter plot for the Table 2.1 data set.

(a) (b)

Figure 2.8 Scatter plots can be used to find (a) positive or (b) negative correlations between attributes.