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
内容
- 0
Which of the following statement about the normal distribution is FALSE() A: It is completely described by its mean and standard deviation. B: It has a skewness of 1. C: It is bell-shaped.
- 1
True or False: Theoretically, the mean, median, and mode are all equal for a normal distribution.
- 2
Given an infinite population with a mean of 75 and a standard deviation of 12, the probability that the mean of a sample of 36 observations, taken at random from this population, exceeds 78 is:
- 3
Theoretically, the mean, median, and mode are all equal for a normal distribution.
- 4
A sample of size 40 is to be taken from an infinite population whose mean and standard deviation are 68 and 12, respectively. The probability that the sample mean will be larger than 70 is: