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Table 3

Paired t-test of comparative differences of recorded temperatures in negative control bottles at 0, 30, 100, and 200 NTU turbidity levels in two experiments

Paired t-test comparison of temperatures betweenNormality/equal varianceWilcoxon signed-rank test*PSignificant difference (P < 0.001)
April 2017 vs 30 NTU Passed/passed N/A <0.001 Yes 
vs 200 NTU Failed/failed Significant difference <0.001 Yes 
30 vs 200 NTU Passed/passed N/A <0.001 Yes 
June 2019 vs 30 NTU Passed/passed N/A <0.001 Yes 
vs 100 NTU Passed/passed N/A <0.001 Yes 
30 vs 100 NTU Passed/passed N/A <0.001 Yes 
Paired t-test comparison of temperatures betweenNormality/equal varianceWilcoxon signed-rank test*PSignificant difference (P < 0.001)
April 2017 vs 30 NTU Passed/passed N/A <0.001 Yes 
vs 200 NTU Failed/failed Significant difference <0.001 Yes 
30 vs 200 NTU Passed/passed N/A <0.001 Yes 
June 2019 vs 30 NTU Passed/passed N/A <0.001 Yes 
vs 100 NTU Passed/passed N/A <0.001 Yes 
30 vs 100 NTU Passed/passed N/A <0.001 Yes 

N/A, not applicable.

*Wilcoxon signed-rank test was conducted after failing the normality test.

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