Air samples. A study of environmental air quality measured suspended particulate matter in air samples at two sites. Data (μg/m3)

for site 1 are {68, 22, 36, 32, 42, 24, 28, and 38}. Data for site 2 are

{36, 38, 39, 40, 36, 34, 33, and 32}. Table 12.9 also lists the data.

TABLE