If we want to guess the proportion of children who are blind to be within 2...
If we want to guess the proportion of children who are blind to be within 2 percentage points of the sample proportion (ME=2%) with 95% confidence, how many children should we sample?
Homework Answers
Solution :
Given that,
= 1 -
= 0.5
margin of error = E = 0.02
Z
/2
= 1.96
sample size = n = (Z
/ 2 / E )2 *
* (1 -
)
= (1.96 / 0.02)2 * 0.5 * 0.5
= 2401
sample size = 2401
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