Statistical prediction intervals for the evaluation of ground-water quality
Factors for a normal distribution are given such that one may be 99% confident that the two-sided prediction interval chi-bar +- rs or the one-sided prediction several chi-bar + rs will contain all of the kappa future values, where chi-bar and s are the sample means and standard deviation obtained from n previous values. In the context of ground-water monitoring, the future samples may represent new monitoring values at each of kappa downgradient wells, and the n previous values might be the historical monitoring results for one or more upgradient wells. The Tables provided in this paper allow the computation of one-sided and two-sided 99% prediction intervals for previous sample sizes of n = 4 to 100 and future samples of kappa = 1 to 100. Modification of these intervals for log-normally distributed data is also presented.
- Research Organization:
- Univ. of Illinois, Biometric Lab., Illinois State Psychiatric Institute, 1601 W. Taylor St., Chicago, IL 60612
- OSTI ID:
- 6031682
- Journal Information:
- Ground Water; (United States), Vol. 25:4
- Country of Publication:
- United States
- Language:
- English
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