Bi-Weekly Quiz 1 每两周一次的测验1

Regardless of the quality of the data, decisions can be made based on the information extracted from the data, but there is no guarantee that these decisions are good or not.
无论数据的质量如何，都可以根据从数据中提取的信息做出决策，但不能保证这些决策是好还是坏。

The population mean and the population median of a symmetric probability distribution have equal values. 
对称概率分布的总体均值和总体中位数具有相等的值。

For a non-symmetric discrete probability distribution, the median is a better measure of central tendency that the mean. 
对于非对称的离散概率分布，中位数是比均值更好的集中趋势度量。

If a dataset contains some outliers, the range will be a better measure of variability than the inter-quartile range, because its value will not be affected by these outliers.
如果数据集中包含一些异常值，那么范围将是一个比四分位距更好的变异度量，因为它的值不会受到这些异常值的影响。

Descriptive statistics can be used to make probability statements about the unknown characteristics of a population. 
描述性统计可以用来对人口的未知特征进行概率陈述。

For any probability distribution, the population upper quartile must be greater than the population lower quartile, while the sample lower quartile may or may not be greater than the sample lower quartile.
对于任何概率分布，总体上四分位数必须大于总体下四分位数，而样本下四分位数可能大于或小于总体下四分位数。

Two non-empty events can be mutually exclusive and independent at the same time.
两个非空事件可以同时是互斥和独立的。

If non-empty events A and B are independent, then P(A) = P(B|A). 
如果非空事件A和B是独立的，则P(A) = P(B|A)。

For a random variable X, the expectation of X is the population mean of X. 
对于随机变量X，X的期望值是X的总体均值。

When a random sample is taken from a probability distribution, if the observed excess kurtosis is negative, then the probability distribution is likely to be skewed to the left. 
当从概率分布中随机抽取样本时，如果观察到的峰度为负，则该概率分布很可能向左偏斜。