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黄石2024-10-17 09:37:24
同学你好。注意题目中明确说明了You are asked to test the null hypothesis that the volatility of Hedge Fund’s monthly returns is equal to 4% versus the alternative hypothesis that the volatility is not equal to 4%,也就是这里的原假设是monthly returns等于4%,备择假设是monthly returns不等于4%。在双尾检验中,原假设永远是总体参数等于某个值;单尾检验中,原假设可以是大于等于,也可以是小于等于,具体取决于题目信息。需要注意的是,等于号永远出现在原假设里。
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