A city planner wants to construct a confidence interval for the proportion of workers who would...
A city planner wants to construct a confidence interval for the proportion of workers who would take public transportation to work if it were available. What sample size should he use to estimate the proportion to within 4 percentage points at a 90% level of confidence?
Homework Answers
Given CI Level = 90%
p = 0.5
ME = 0.04
z-value of 90% CI = 1.6449
n = (z/ME)^2*p*(1-p) = 423
Sample size = 423
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