In paired t test, the Ha should be:()
A. μ=μ0
B. μ≠μ0
C. μ1=μ2
D. μd≠0
E. μd=0
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If n1=10 and n2=11, the d.f. in the t test for two independent means should be:()
A. 10
B. 19
C. 11
D. 1
E. 21
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
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