A Brief Introduction to Biostatistics

(C. Jardin) #1

Sampling distribution of the mean



  • 95% sample means of the sampling distribution
    can be found within the limit of 1.96

  • Can be rewritten as


Pr( 1.96 <=  <= + 1.96 ) = 0.95


n


n


n

X 
X

95% confidence interval
X

X X X

X X X

X X

X

-1.96 ^
n

 +1.96
n


Standard error
of the sample
mean S.E. X
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