回答(1)
ES2023-04-03 11:13:37
同学,你好
sample standard deviation of 8.50⟶standard error (SE) is 8.5/√20
t-stat = (20-15)/[8.5/√20] = 2.631>2.326
α = 1% (C1%=2.326 or -2.326)
t-stat =2.631>2.326
we reject the null that μ>15.0
选错的,所以选D
加油,祝你顺利通过考试~
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