A: Coefficient of variation
B: The standard deviation
C: Standard deviation of the mean
D: Range value
举一反三
- Given the following information: Standard deviation = 8 Coefficient of variation = 64% The mean would then be
- The standard error of the mean is never larger than the standard deviation of the population.
- 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:
- 以下哪个统计量指标不用于描述数据集的离散程度。 A: Variation B: Standard Deviation C: Range D: Geometric Mean
- 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?
内容
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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:
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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.
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Presenting as mean ± standard deviation, the results were analyzed with SPSS 23.
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B1型题 表示正态分布的资料中数据的离散程度最常用的指标为（） A: mean B: vanance C: percentile D: standard deviation E: coefficient of variation
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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.