Biostatistical And Pharmacoeconomic Measures
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QUESTION
What is the formula for specificity of a diagnostic test?
QUESTION
What is the formula for a
z
z
z
-score for an observation
x
x
x
from mean
μ
\mu
μ
and
S
D
SD
S
D
?
QUESTION
What is the formula for standard error of the mean (SEM) using
S
D
SD
S
D
and
n
n
n
?
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ANSWER
S
E
M
=
S
D
n
SEM=\frac{SD}{\sqrt{n}}
S
E
M
=
n
S
D
. Divides the standard deviation by the square root of sample size to estimate mean variability.
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