Consider the Wald confidence interval for a binomial parameter π. Since it is degenerate when =0 or 1, argue that for 0<π>π><1 the="" probability="" the="" interval="" covers="" π="" cannot="" exceed="">1>n-(1-π)n]; hence, the infimum of the coverage probability over 0<π>π><1 equals="" 0,="" regardless="">1>n.
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