25--- Asap Let > 0 be an unknown parameter and T > 0 be...
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25--- Asap
Let > 0 be an unknown parameter and T > 0 be a statistic. Suppose that T / is a pivotal quantity having Lebesgue density f and that x2f(x) is unimodal at x0 in the sense that f(x) is nondecreasing for x x0 and f(x) is nonincreasing for x x0. Consider the following class of confidence intervals for : C = [b1T,a1T] : a > 0,b> 0, b a f(x)dx = 1 " . Show that if [b1 T,a1 T] C, a2 f(a) = b2 f(b) > 0, and a x0 b, then the interval [b1 T,a1 T] has the shortest length within C.
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