Oxygen was the only variable
for which a statistically significant number of off-reservation sites showed
either an upward or a downward trend.
Of the sites that showed a trend, the sites with increasing oxygen levels
showed a marked predominance over those with decreasing oxygen levels. This is unexpected, and contrasts with the
results for the sites on the Ute Reservation.
Results for O2 trends at non-reservation sites are summarized
in Table 8.
Table 12. Summary of T-Test
results, O2 for 147 off-reservation sites.
|
Significance Level |
U
Number
of Sites with Upward Trend |
D
Number
of Sites with Downward Trend |
U+D
Number
of Sites with Any Trend |
Expected
Number of Sites with Any Trend |
Probability
of U out of U+D Sites Increasing (see
Note 1) |
Probability
of U+D Sites with Any Trend (see
Note 2) |
|
||
|
99.9% |
2 |
0 |
2 |
0 |
0.250 |
8.05E-03 |
|||
|
99.0% |
8 |
0 |
8 |
1 |
0.004 |
6.47E-05 |
|||
|
95.0% |
26 |
1 |
27 |
7 |
2.0E-07 |
2.33E-09 |
|||
Table 13. Sen and Mann-Kendall
statistics, O2 for 147 sites off the Southern Ute Reservation.
|
Significance Level |
Sites
with Positive Sen estimator |
Sites
with Negative Sen
estimator |
Sites with Positive Mann-Kendall statistic
|
Sites
with Negative Mann-Kendall statistic |
|
99.0% |
4 |
0 |
5 |
0 |
|
95.0% |
19 |
5 |
19 |
8 |
Chi-square estimate of
homogeneity for the Mann-Kendall scores: less than 0.0001%.