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<br />11 <br />II Figure ll. <br />III <br />~ <br />II <br />III <br />III <br />III <br />iii <br />III <br />.. <br />. <br />-- <br />-- <br />III <br />II <br />-- <br />II <br />II <br />II <br />II <br />'l,\it". <br /> <br />Time (years or events) required with different 500 mb <br />temperature design criteria to detect changes in pre- <br />cipitation comparable to those found during the Colorado <br />State University Wolf Creek Pass Experiment. This is <br />the time interval to provide a 50 percent chance of <br />obtaining significance at the 5 percent level with a <br />one-sided test. It assumes that (1) the frequency <br />of storms during any given year in the San Juan <br />area is the same as the average frequency during 1964-1970, <br />and that l/Z of all seedable events are actually seeded. <br />NPl uses a normalized tie adjusted Wilcoxon test. <br />NFZ uses a normalized tie adjusted sum of squared <br />ranks test . . . .. ............ 36 <br /> <br />iii <br /> <br />............ <br />