问题


There is a single choice question about high school statistics. Answer the question by replying A, B, C or D.
Question: Which of the following is the best description of the power of a significance test?
A. The probability that the null hypothesis is true.
B. The probability of getting a Type I error.
C. The probability of getting a Type II error.
D. The probability of rejecting the null hypothesis if it is, in fact, false.
Answer:

答案

模型 模型答案 正确答案
金声玉亮2.0

D. The probability of rejecting the null hypothesis if it is, in fact, false.
D
deepseekr1

The power of a significance test is defined as the probability of correctly rejecting the null hypothesis when it is false. This distinguishes it from Type I error (B, related to falsely rejecting the null) and Type II error (C, failing to reject a false null, where power = 1 - Type II error). Option A incorrectly frames power as the probability of the null hypothesis being true, which is not a valid concept in frequentist statistics. Thus, the correct answer is **D**.

Answer: D
D
gpto1 D D
GPT-4o D. The probability of rejecting the null hypothesis if it is, in fact, false. D
llama3.1-70B-Instruct

D
D
llama3.1-405B-Instruct

D. The power of a significance test is the probability of rejecting the null hypothesis if it is, in fact, false. This means that it is the probability of correctly rejecting a false null hypothesis, which is the opposite of a Type II error (failing to reject a false null hypothesis). Therefore, option D is the correct answer.

Option A is incorrect because the power of a test does not refer to the probability that the null hypothesis is true. Option B is also incorrect because the power of a test is not related to the probability of getting a Type I error (rejecting a true null hypothesis). Option C is incorrect because the power of a test is actually the opposite of the probability of getting a Type II error.
D
DeepSeek-Coder-V2 D D
Qwen2-72B-Instruct D. The probability of rejecting the null hypothesis if it is, in fact, false. D
baichuan4 D D
doubao D. The probability of rejecting the null hypothesis if it is, in fact, false. D
minimax D. The probability of rejecting the null hypothesis if it is, in fact, false. D
kimi D D
wenxinyiyan D D
zhipu D. The probability of rejecting the null hypothesis if it is, in fact, false.

The power of a significance test is defined as the probability that the test correctly rejects a false null hypothesis. This means it measures the test's ability to detect an effect when there actually is one. Therefore, the best description of the power of a significance test is option D.
D
gpto1 D D
deepseekv3 D. The power of a significance test is the probability of rejecting the null hypothesis if it is, in fact, false. This means that the test correctly identifies a true effect or difference, which is the opposite of a Type II error (failing to reject a false null hypothesis). D