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STOTE OF COIOan DO 4iC'+^eD O .•44 Govc•-o. <br /> <br />DEPARTMENT OF NATURAL RESOURCES <br />0. Monte Pauoe, EYecut~ve D~ractor <br />titLVED LA\D RECL:~tiIA'TION <br />423 Centennial Building, 1313 Sherman Street <br />Denver, Colorado 60203 Tel. (303) 83&3567 <br />David C. Shelton <br />Director <br />July 14, 1981 <br />• <br />• <br />Mr. David Duba <br />Morrison-Knudsen Company, Inc. <br />Two Morrison-Knudsen Plaza <br />P.O. Box 7808 <br />Boise, Idaho 83729 <br />Dear David: <br />Enclosed is a copy of my June 12, 1981 memorandum which addresses topics <br />which we discussed on ei`tpf€ 10, 1981 with Brian Munson and Cass Legal. <br />)!t r~ <br />I would reiterate that T have analyzed the X-C data in a manner irrespective <br />of the sample adequacy formula question and found a large proportion of the <br />data to be below the minimum ccefidence Levels X-G has committed to (August <br />5, 1980 Zetter from D. Duba to Carol Pahlke and Jim Rerron). <br />Regarding the discussion on utilization of two-tailed versus one-tailed <br />analysis, I would submit that rn the estimation of a parameter (for sample <br />adequacy purposes) utilizing the formula <br />t a: n (dx) ) , <br />it is appropriate to determine the level of confidence achieved by applying <br />the values fran none-tailed distributia~n. Since, in this instance, one is <br />constructing the confidence limits about the wean, a two-tailed application is <br />intrinsically implicated. In utilizing a one-tailed application, one <br />becomes concerned telly with values which are above the upper critical value <br />(of the confidence interval), effectively accepting aII values below this <br />critical point. This approach does not create a confidence interval about <br />the mean. <br />If you have any questions or comments, please contact myself or Brian Munson. <br />Singer/edgy, <br />gs,,._ <br />Michael S. Sava ~`'~`" <br />Reclamation Specialist' <br />MSS/mart <br />Enclosures <br />