Statistical inference includes:()
A. central tendency and dispersion
B. t test and z test
C. estimation and hypothesis testing
D. distribution and sampling error
E. discrete and continuous
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For the t distribution, when t value increases, its corresponding P value:()
A. increases
B. unchanged
C. decreases
D. increases, and then decreases
E. decreases, and then increases
The type Ⅰ error happens when: ()
A. H0 is true
B. H0 is rejected
C. H0 is false, but we accept H0
D. H0 is true, but we reject H0
E. P is samll
There is a data set shown as follow: 17, 1, 12, 6, 9, 2, 8, 41. The arithmetic mean is:()
A. 8.5
B. 12
C. 8
D. 17
E. 9
Which measure should be used to compare the variability between height and weight. ()
A. CV
B. variance
C. range
D. standard deviation
E. inter-quartile range
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