Exercise 12.5 A study of environmental air quality measured suspended particulate matter in air samples at two sites. Table 12.9 list the data. What is the group mean for Site 1? Use two places after the decimal. You may use SPSS to determine this calculation by using the data set which can be found here: airsamples.sav Download airsamples.sav Site 1 68 22 36 32 42 24 28 38 Site 2 36 38 39 40 36 34 33 32