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.
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?
1 answer