Which of the following is the correct formula for the margin of error of a population mean where the population standard deviation is not known?
EBM
=
z
⋅
σ
n
\displaystyle ={z}\cdot\frac{\sigma}{\sqrt{{{n}}}}
=
z
⋅
n
σ
EBM
=
t
⋅
s
n
\displaystyle ={t}\cdot\frac{{s}}{\sqrt{{{n}}}}
=
t
⋅
n
s
t
=
x
‾
−
μ
s
n
\displaystyle {t}=\frac{{\overline{{x}}-\mu}}{{\frac{{s}}{\sqrt{{{n}}}}}}
t
=
n
s
x
−
μ
EBP
=
z
⋅
p
′
⋅
q
′
n
\displaystyle ={z}\cdot\sqrt{{\frac{{{p}'\cdot{q}'}}{{n}}}}
=
z
⋅
n
p
′
⋅
q
′
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