题目内容

Which of the following statements of null and alternative hypotheses requires a two-tailed test？

A. H_{0:θ＝θ_{0 versus Ha:θ≠θ₀}}
B. H_{0:θ≤θ_{0 versus Ha:θ＞θ₀}}
C. H_{0:θ≥θ_{0 versus Ha:θ＜θ₀}}

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