题目内容

Which measure should be used to describe the central tendency of the symmetrical distribution.()

A. median
B. arithmetic mean
CV
D. inter-quartile range
E. standard deviation

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Which measure should be used to describe the dispersion of the skewed distribution. ()

A. range
B. arithmetic mean
CV
D. inter-quartile range
E. median

There is a normal distribution x~N(0, 100), what is the standard deviation:()

A. 0
B. 10
C. 100
D. 10000
E. 1

How much is the area of the normal distribution from μ-1.64σ to μ+1.64σ? ()

A. 95%
B. 90%
C. 97.5%
D. 47.5%
E. 45%

The degree of freedom in χ2 test for 2×2 table is:()

A. 0
B. n
C. n-1
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E. 4