What is the formula for the confidence interval for u with o unknown? O A. xit-a/2; n-1 S. O B. x+Z1 -a/2" c. xit-a/2; n-1 n O D. x+Z1-a/2" Vn

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What is the formula for the confidence interval for u with o unknown?
O A.
xit4-a/2; n-1
Vn
О в.
xtZ1-a/2
C.
xtt-a/2; n-1
O D.
x+Z1 -a/2
Vn
Transcribed Image Text:What is the formula for the confidence interval for u with o unknown? O A. xit4-a/2; n-1 Vn О в. xtZ1-a/2 C. xtt-a/2; n-1 O D. x+Z1 -a/2 Vn
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