A. variance B. spread C. mean D. median 相关知识点: 试题来源: 解析 B。本题主要考查对标准差概念的理解。标准差是衡量数据分散程度的指标,也就是spread。选项 A 方差与标准差不同;选项 C 均值不是标准差的含义;选项 D 中位数也与标准差无关。反馈 收藏 ...
解析 B。解析:标准差(standard deviation)是衡量数据离散程度(spread or dispersion of data)的统计量。它表示数据相对于均值的分散情况。均值是衡量数据中心位置(The central location of data)的一种方式。相关系数是衡量两个变量之间关系(The relationship between two variables)的统计量。
A. central tendency B. variability C. symmetry D. skewness 相关知识点: 试题来源: 解析 B。A 选项 central tendency 中心趋势。B 选项 variability 变异性,标准差是衡量数据离散程度,即变异性的指标,符合题意。C 选项 symmetry 对称性。D 选项 skewness 偏度。反馈...
“The standard deviation is a measure of the dispersion of a set of numbers.” In this statement, “standard deviation” is not similar to ___. A. mean deviation B. variance C. coefficient of variation D. arithmetic mean 相关知识点: 试题来源: 解析 D。“standard deviation”是标准差...
Standard deviation is a measure of how much the realizations of arandom variableare dispersed around its mean. It is equal to the square root of variance. Definition A precise definition follows. DefinitionLet be a random variable and let ...
标准差(Standard Deviation) Standard Deviation is a measure of how far away the points in the data set are from the average value。 应对SAT数学的考试,我们只需要简单的理解为:Standard Deviation能反映一个数据集的离散程度,一组数据的离散程度越大,Standard Deviation越大,反之亦然。
A. central tendency B. dispersion C. frequency D. correlation 相关知识点: 试题来源: 解析 B。本题考查统计学中标准偏差的概念。标准偏差是用来衡量数据的离散程度,即分散程度,选项 A 中心趋势通常由均值、中位数等表示;选项 C 频率指某个值出现的次数;选项 D 相关性用于描述两个变量之间的关系。反馈...
a简单来说,标准差是一组数据平均值值分散程度的一种度量。一个较大的标准差,代表大部分数值和其平均值之间差异较大;一个较小的标准差,代表这些数值较接近平均值。 Simply speaking, the standard deviation is a group of data mean value value dispersion degree one kind of measure.A big standard deviation...
The standard deviation is a measure of the spread of scores within a set of data. Usually, we are interested in the standard deviation of a population. However, as we are often presented with data from a sample only, we can estimate the population standard deviation from a sample standard ...
Standard deviation is a measure ofhow spread out numbers are from the average of a data set. It is not the same asaverage or mean deviationorabsolute deviation, where the absolute value of each distance from the mean is used, so be careful to apply the correct steps when calculating deviat...