An environmental study looked at suspended particulate matter in air samples (µg/m3) at two different sites. Data are listed here. Construct a stemplot of for each site (here is where side-by-side stemplots would be helpful but not required) and then compare the distribution of suspended particulate matter between the two sites (remember to mention center and spread). No calculations necessary.
Site 1: 68 22 36 32 42 24 28 38
Site 2: 36 38 39 40 36 34 33 32
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Stemplot for Site 1:
2 | 2 4 8
3 | 2 6 8
4 | 2
6 | 8
Stemplot for Site 2:
3 | 2 3 4 6 6 8
4 | 0
Comparison:
The center of the distribution for Site 1 seems to be in the 30s, while the center for Site 2 is also in the 30s. However, the spread of the data for Site 1 is larger, ranging from the 20s to the 60s, while the spread for Site 2 is smaller, ranging only from the 30s to the 40s. This suggests that the particulate matter in the air at Site 1 varies more than at Site 2. The distribution for Site 1 is also more skewed, with a longer tail on the right, indicating a few higher values. The distribution for Site 2 is more symmetric.
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