题目内容

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

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

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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
D. 1
E. 4

To compare the difference of the mean among three populations, which of the following methods should be used?()

A. t test
B. z test
C. ANOVA
D. chi-square test
E. Wilcoxon rank sun test

Which is the key step of statistical work ?()

A. Statistical design
B. Data collection
C. Data management
Data analysis
E. Statistical inference

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