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<br />.'-_.'.._<.;..'~.- <br /> <br />_ '... .:.::~2~~;:~ .:-, >. <br /> <br /> <br />.j~::." <br /> <br />3 <br /> <br />slope to a less steep positive slope or to a negative slope <br /> <br />a reduction in salt load. A change from a negative slope to a <br /> <br />c <br />w <br />~ <br />~I~ <br /> <br />less steep negative slope or to a positive slope indicates an ' <br /> <br />increase in salt load. <br /> <br />3. The residual mass diagram for the Colorado River <br /> <br />station (Figure 2) shows a change in slope, from positive to nega~ <br />. <br /> <br />tive, after 1955 and to a much greater negative slope after 1967. .. <br /> <br />Because the major change in slope occurs after 1967, the means of <br /> <br />residuals for the period 196$ through 1976 and for the period 1941 <br /> <br />through 1967 were compared to determine whether or not <br /> <br />are significantly different. The 90 percent level <br /> <br />(two-tailed test) was selected for accepting the hypothesis that <br /> <br />thp means are different. <br /> <br />4. Using Student's t test, with the length of the <br /> <br />adjusted to account for serial correlation, it was determined <br /> <br />the mean of the residuals for the 196$ through 1976 period is <br /> <br />significantly different from the mean of the residuals for the <br /> <br />.>1; ,. ,'. <br />