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Page Title:
COMPARISON OF MEAN DREDGED SEDIMENT BIOACCUMULATION WITH ACTION LEVEL: UPPER CONFIDENCE LIMITS (UCL) WHEN VARIANCES ARE UNEQU... |
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 COMPARISON OF MEAN DREDGED SEDIMENT BIOACCUMULATION WITH ACTION LEVEL:
UPPER CONFIDENCE LIMITS (UCL) WHEN VARIANCES ARE UNEQUAL
UCL
MINIMUM
TREATMENT
MEAN
(UNEQUAL
T VALUE FOR
SIGNIFICANT
GROUP
BIOACCUMULATION VARIANCES) VARIANCE (1-ALPHA=.95,N-1) N DIFFERENCE
SEDIMENT 1
0.212
0.26816
.00347
2.13185
5
0.056161
SEDIMENT 2
0.190
0.26745
.00660
2.13185
5
0.077454
SEDIMENT 3
0.130
0.19501
.00465
2.13185
5
0.065013
POWER TO DETECT % DECREASE IN CONCENTRATION BELOW
ACTION LEVEL OF 0.2 ug/g GIVEN N, MSE AND DF SHOWN ABOVE
% DECREASE
BELOW
MEAN DREDGED
T VALUE
ACTION
SEDIMENT
FOR
POWER
LEVEL
BIOACCUMULATION
D
(1-BETA,DF) (1-BETA)
10
0.18
0.02
-1.01680
0.16219
20
0.16
0.04
-0.28772
0.38863
30
0.14
0.06
0.44136
0.66757
40
0.12
0.08
1.17045
0.87052
50
0.10
0.10
1.89953
0.96216
L.5 References
Alldredge, J. R. (1987). "Sample size for monitoring of toxic chemical sites,"
Environ. Monit. Assess. 9, 143-154.
Capizzi, T., Oppenheimer, L., Mehta, H., Naimie, H., and Fair, J. L. (1985).
"Statistical considerations in the evaluation of chronic aquatic toxicity
studies," Environ. Sci. Technol. 19, 35-43.
Clarke, J. U. (1998). "Evaluation of censored data methods to allow statistical
comparisons among very small samples with below detection limit
observations," Environ. Sci. Technol. 32(1), 177-183.
Clarke, J. U., and Brandon, D. L. (1996). "Applications guide for statistical
analyses in dredged sediment evaluations," Miscellaneous Paper D-96-2,
U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS.
Conover, W. J. (1980). Practical nonparametric statistics. 2nd ed. Wiley,
New York, 493.
Conover, W. J., Johnson, M. E., and Johnson, M. M. (1981). "A comparative
study of tests for homogeneity of variances, with applications to the outer
continental shelf bidding data," Technometrics 23, 351-361.
Dixon, W. J., and Massey, Jr., F. J. (1983). Introduction to statistical analysis.
4th ed., McGraw-Hill, New York, 678.
L60
Appendix L Selected Resource Documents
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