Jimmy2022-03-28 10:30:45
An analyst believes that hedge funds have significantly (using a significance level of 0.05) outperformed the S&P 500 over the past five years. So she picks a random group of 15 hedge funds and finds that their mean return over this period is 85% and their standard deviation is 45%. During the same period the S&P 500 has risen by 75%. The critical value of the t-statistic for this study is:
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Jenny2022-03-28 13:46:11
同学你好,题目的意思是,分析师认为对冲基金hedge fund的收益是要高于(outperformed)sp 500的,他收集的数据表明对冲基金的收益是85%,sp500的收益是75%,所以他想要证明的是对冲基金是否显著高于sp500收益,这个没有等号应该放在备择假设。也就是原假设应该是85%<=75%。无论如何,这题肯定是单尾的。最终题目问的是查表值,critical value,所以我们只要找95%置信水平下,单尾的t分布查表值,也就是1.76,这里用t分布是因为这个是个小样本(只有15哥对冲基金的数据)。
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