题目内容

If a variable follow a Poisson distribution(泊松分布), then their( ).

A. mean equals the standard deviation.
B. median equals the standard deviation.
C. mean equals the variance.
D. median equals the variance.

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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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If a variable follow a Poisson distribution(泊松分布), then their( ).

A. mean equals the standard deviation. B. median equals the standard deviation. C. mean equals the variance. D. median equals the variance.

The standardized normal distribution(标准正态分布)( ).

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。( )

A. mean equals the standard deviation.
B. median equals the standard deviation.
C. mean equals the variance.
D. median equals the variance.