This experiment concerns the precision of one type of collecting tubes used for air sampling of hydrofluoric acid. The tubes are tested three times at five different concentrations. The data shown in Table 4.8 give the differences between the three observed and true concentrations. 

The differences are required to have a standard deviation of no more than 0.1. Does this type of tube meet this criterion? (Careful: What is the most appropriate sum of squares for this test?)

Transcribed Image Text:

Table 4.8 Data for Exercise 23. Concentration Differences 1 1 1 1 1 1234+15 0.112 0.163 0.151 2 - 0.117 0.072 0.169 - 0.006 -0.092 0.268 0.119 0.118 0.051 - 0.272 -0.302 0.343