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cst6666 · 2024年07月18日

Q

  1. CFA I
  2. Quantitative

NO.PZ2022123001000107

问题如下：

Consider a two-tailed test of the hypothesis that the population mean is zero. The sample has 50 observations. The population is normally distributed with a known variance.


At a 0.05 significance level, the rejection points are most likely at:

选项：

A.–2.010 and 2.010 B.–2.009 and 2.009 C.–1.960 and 1.960

解释：

The appropriate test statistic is a z-statistic because the sample comes from a normal distributed population with known variance. A z-test does not use degrees of freedom. This test is two-sided at the 0.05 significance level, and the rejection point conditions are z > 1.960 and z < –1.960.

这个题目表格出法很奇怪不同于正常的表格，考试会这样给吗？

那t 表格也是这种给法吗？

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品职助教_七七 · 2024年07月19日

嗨，努力学习的PZer你好：


这种给法是正常给法。只是如果强调一下这是一张 two-tailed的表格，会更容易辨别。

表格的上半部分就是t表。一般考试也很少给出整张t表或者z表来查。

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虽然现在很辛苦，但努力过的感觉真的很好，加油！

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