单选题 Which of the following statements about hypothesis testing is FALSE? A. The null hypothesis is a statement about the value of a population parameter. B. A Type Ⅱ error is failing to reject a false null hypothesis. C. If the alternative hypothesis is H_a: μ＞μ₀, a two - tailed test is appropriate.

【正确答案】 C

【答案解析】The hypothesis are always stated in terms of a population parameter. Type Ⅰ and Type Ⅱ are the two types of errors you can make - reject a null hypothesis that is true or fail to reject a null hypothesis that is false. The alternative may be one - sided ( in which case a ＞ or ＜ sign is used) or two -sided (in which case a ≠ is used).