Table 3.
Summary statistics for Site A divided into subtasks by instrument.
| Summary statistics by instrument | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| ||||||||||||
| CPC | DustTrak | |||||||||||
|
| ||||||||||||
| Particle concentration | Mass concentration | |||||||||||
|
| ||||||||||||
| particles cm−3 | mg m−3 | |||||||||||
|
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| Process | Subtask | n | Subtask GM | Subtask GSD |
Background GM |
Background GSD |
Adjusted P-valuea |
Subtask GM |
Subtask GSD |
Background GM |
Background GSD |
Adjusted P-valuea |
| MWCNT production | A-1 | 26 | 1.9E+03 | 1.04 | 2.9E+03 | 1.55 | 0.002b | 0.018 | 1.03 | 0.045 | 1.03 | 0.000b |
| A-2 | 26 | 2.3E+03 | 1.11 | 2.9E+03 | 1.55 | 0.025b | 0.020 | 1.06 | 0.045 | 1.03 | 0.000b | |
| A-3 | 28 | 5.5E+03 | 1.46 | 3.4E+03 | 1.13 | 0.000 | 0.022 | 1.05 | 0.044 | 1.04 | 0.000 | |
| A-4 | 28 | 8.9E+03 | 1.13 | 2.5E+03 | 1.08 | 0.000 | 0.024 | 1.05 | 0.045 | 1.01 | 0.000 | |
| A-5 | 28 | 1.10E+04 | 1.06 | 2.6E+03 | 1.12 | 0.000 | 0.027 | 1.04 | 0.046 | 1.02 | 0.000 | |
| A-6 | 28 | 1.27E+04 | 1.15 | 3.1E+03 | 1.19 | 0.000 | 0.029 | 1.17 | 0.045 | 1.02 | 0.000 | |
| A-7 | 20 | 1.85E+04 | 1.23 | 3.3E+03 | 1.09 | 0.000 | 0.030 | 1.05 | 0.044 | 1.02 | 0.000 | |
| Harvesting MWCNTs | B-1 | 23 | 3.13E+04 | 1.04 | 5.3E+03 | 1.13 | 0.000 | 0.030 | 1.05 | 0.046 | 1.17 | 0.000 |
| B-2 | 22 | 3.23E+04 | 1.04 | 4.2E+03 | 1.24 | 0.000 | 0.034 | 1.04 | 0.040 | 1.08 | 0.000 | |
| Harvesting DWCNTs | C-1 | 6 | 3.18E+04 | 1.04 | 1.8E+03 | 1.05 | 0.000 | 0.032 | 1.04 | 0.025 | 1.02 | 0.018 |
| Harvesting MWCNTs (second batch) | D-1 | 17 | 8.7E+03 | 1.02 | 2.4E+03 | 1.15 | 0.000 | 0.036 | 1.04 | 0.029 | 1.02 | 0.000 |
Note: All P-values were adjusted using a Bonferroni adjustment for the number of subtasks in a given day.
a
Default P-values were computed using a paired analysis of indoor versus outdoor background; all statistical tests accounted for autocorrelation of data.
b
No concurrent background sample collected, compared with averaged process measurements during entire process; Outdoor background used for paired analysis compared with process measurements.