A note

Just a note

C_L =	a − b	C_U =	a + b

	c		c

where:

C_L and C_U are the lower and upper confidence limits,
a = p +(z²/2n) ,

b = z √
pq + (z²/4n)

n
c = 1+ z²/n,
p and q are the proportions in the sample with and without the character of interest,
n is the sample size,
z is the 1 − α/2 percentile of the standard normal distribution where α is the significance level; for a 95% confidence interval z = 1.96.

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