The standardized normal distribution(标准正态分布)( ).
A. has a mean of 0 and a standard deviation of 1.
B. has a mean of 1 and a variance of 0.
C. has an area equal to 0.5.
D. cannot be used to approximate discrete probability distributions.
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气温数据属于比例尺度(ratio scale)的数据。()
描述性统计(descriptive statistics)就是用样本数据对总体的特征进行推断。()
海拔高度数据属于比例尺度(ratio scale)的数据。( )