2.Which of the following about the normal distribution is NOT true
A: Theoretically, the mean, median, and mode are the same.
B: About 2/3 of the observations fall within ±1 standard deviation from the mean.
C: It is a discrete probability distribution.
D: Its parameters are the mean, μ, and standard deviation, σ.
A: Theoretically, the mean, median, and mode are the same.
B: About 2/3 of the observations fall within ±1 standard deviation from the mean.
C: It is a discrete probability distribution.
D: Its parameters are the mean, μ, and standard deviation, σ.
举一反三
- Which of the following about the normal distribution is NOT true? A: Theoretically, the mean, median, and mode are the same B: About 68% of the observations fall within ±1 standard deviation from the mean C: Its parameters are the mean, μ, and standard deviation, σ D: It is a discrete probability distribution.
- Which of the following is true about the sampling distribution of the sample mean? A: The mean of the sampling distribution is always μ. B: The standard deviation of the sampling distribution is always σ. C: The shape of the sampling distribution is always approximately normal. D: D) All the alternatives are correct
- 中国大学MOOC: A population distribution is normal with a mean of 18 and standard deviation of 4. A sample of 16 observations is selected and a sample mean computed. What is the probability that the sample mean is more than 18?
- After preparing the probability distribution of cost outcome for a project, the estimate, with a 15% probability of being exceeded, is approximately one standard deviation （）. A: below the mean B: above the median C: above the mean D: above the median
- After preparing the probability distribution of cost outcome for a project, the estimate, with a 15% probability of being exceeded, is approximately one standard deviation ______ . A: A) below the mean B: B) above the median C: C) above the mean D: D) above the median