Sample Size N = 752.
What is Population Proportion?
A population proportion is the percentage of a population that falls into a specific category. Population proportions are estimated using confidence intervals.
Given,
A margin of error of 0.03
Z = 1.645 at 90% confidence level
We use P=0.5 because there is no prior information about the population proportion.
To find minimum number of subjects n
= (Z*/M.E.)2 x P (1-P)
Solving by entering the given values into a formula: -
n = (1.645/0.03)2 × 0.5(1-0.5)
n = 3006.70 X 0.25
n= 751.67
Sample Size N = 752
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