TABLE 8.

Power analysis: differences between the percent positive (Table 6 data) values observed by the EPA Method 1601, the Fast Phage STEP-1 plaque, and the fluorescence-based predictiona

Waste source1601 vs STEP-11601 vs fluorescenceSTEP-1 vs fluorescence
% differenceNo. of samples required to detect observed differencesb% differenceNo. of samples required to detect observed differencesb% differenceNo. of samples required to detect observed differencesb
M 10-15-080.0NAc−5.0824−5.0824
L 09-09-0810.03045.01,019−5.01,043
SA12-18-0820.07215.0115−5.0931
L 06-26-0810.025840.01430.028
O 1230085.01,234−5.01,043−10.0260
O 0102095.086210.01995.0725
Summary over all sources8.344310.02041.77,379
  • a The total number of samples was 20.

  • b Number of samples that would be required to detect any differences as significant based on a binomial two-tailed power analysis.

  • c NA, not applicable.