Odour Threshold Investigation 2012 - Bay of Plenty Regional Council

Whakatane
statistic
estimate
(µg/m^3) confidence interval
Mean 1.02 (.59, 1.77)
Median 0.53 (.39, .73)
% detecting 2 µg/m^3 89% (77%, 96%)
% detecting 7 µg/m^3 99% (94%, 100%)
Rotorua
statistic
estimate
(µg/m^3) confidence interval
Mean 1.85 (1.35, 2.54)
Median 1.4 (.72, 3.44)
% detecting 2 µg/m^3 69% (54%, 81%)
% detecting 7 µg/m^3 98% (90%, 100%)
Location effects on butanol threshold
Analysis of the butanol data using similar methods to those used above showed that the
location difference in geometric means was not statistically significant. However the
variation in the Rotorua data was significantly greater than that for Whakatane.
The t-test results for log e (butanol threshold) were as follows:
Two-sample T for lnMnbut
Location N Mean StDev SE Mean Median
Est Geometric
Mean
Rotorua 29 0.159 0.291 0.054 238 281.5
Whakatāne 30 -0.208 0.362 0.066 237 221.2
Difference = mu (Rotorua) - mu (Whakatāne).
Estimate for difference: 0.244.
95% CI for difference: (-0.218, 0.707).
T-Test of difference = 0 (vs not =): T-Value = 1.07 P-Value = 0.291 DF = 36.
68 Environmental Publication 2012/06–A review of odour properties of H 2 S Odour Threshold Investigation 2012