作者bubble0410 (瘋狂的陽光)
看板Statistics
標題[問題] effect
時間Thu May 31 02:57:55 2018
1.If a treatment has a very small effect, what is a likely outcome for a hypothesis test evaluating the treatment?
A. A Type I error
B. A Type II error
C. Correctly reject the null hypothesis
D. Correctly fail to reject the null hypothesis
E. Answer cannot be determined from the information provided
2.Under what circumstances can a very small treatment effect be statistically significant?
A. If the sample size big and the sample variance is small.
B. If the sample size and the sample variance are both big.
C. If the sample size is small and the sample variance is big.
D. If the sample size and the sample variance are both small.
E. None of A-D is true.
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最近在自學社統跟練習題目，有2題我看不懂它題目本身的意思
不知道我是漏念了什麼，還是只是看不懂英文……
想請問這兩題是在問什麼？
我想不通a very small effect是什麼意思，要從哪查起
1.「a treatment has a very small effect」
2.「a very small treatment effect」
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1F：推 lalial: a very small effect "size" 05/31 03:52
2F：推 lalial: use a t test formula may help you understand the quest 05/31 03:56
3F：→ lalial: ions 05/31 03:56
4F：→ andrew43: 效果量很小表示虛無假設不對，但除非power夠大（如樣本 05/31 07:50
5F：→ andrew43: 數很大、組內變異很小）否則很難拒絕它。 05/31 07:50
6F：推 andrew43: 你可以查 statistical effect size 05/31 08:06
7F：→ yhliu: 當 treatment 確實有 a very small effect 時,做 hypothese 06/01 06:06
8F：→ yhliu: test 將很不容易 reject null hypothesis, 除非樣本數非常 06/01 06:10
9F：→ yhliu: 大, 或允許很大的 type I error 機率. 也就是說,犯 type II 06/01 06:12
10F：→ yhliu: error 的機會是可能比較大的. 06/01 06:14
11F：→ yhliu: 承上, 若 true treatment 是 very small 而檢定結果顯示 be 06/01 06:16
12F：→ yhliu: statistical significant, 除了運氣便然, 就是 sample size 06/01 06:18
13F：→ yhliu: 相對於 sample variance 來說很大, 以至於 standard error 06/01 06:20
14F：→ yhliu: 很小, 也就是說, sample size is big 以及 sample variance 06/01 06:22
15F：→ yhliu: is small. 06/01 06:22