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.
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.
举一反三
- 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.
- 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