Asked by Farah
Researcher wants to estimate the proportion of Canadians that are over the age of 65, accurate to within 2% using a 95% confidence interval. What is the minimum number of people that should be sampled?
Answers
Answered by
MathGuru
Formula to find sample size:
n = [(z-value)^2 * p * q]/E^2
... where n = sample size, z-value is 1.96 and is found using a z-table for 95% confidence, p = .5 (when no value is stated), q = 1 - p, ^2 means squared, * means to multiply, and E = .02 (or 2%).
I'll let you take it from here to calculate. Round your answer to the next highest whole number.
n = [(z-value)^2 * p * q]/E^2
... where n = sample size, z-value is 1.96 and is found using a z-table for 95% confidence, p = .5 (when no value is stated), q = 1 - p, ^2 means squared, * means to multiply, and E = .02 (or 2%).
I'll let you take it from here to calculate. Round your answer to the next highest whole number.
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