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Let yt (t = 1, 2,..., k) be statistical quantities normally and independently distributed with means fit and variances A,erf, respectively, where the A, are known constants but nothing is known about /it and cr\\. Suppose that the data provide estimates sf of the T \\ which are distributed, respectively, as;tfcrf// ( where/ ( is the number of degrees of freedom of x2-
B. L. Welch (Mon,) studied this question.