p = x/n = 146/390 = 0.3744
Z for 90% confidence intercval = Z0.05 = 1.645
Margin of error = Z0.05 * sqrt(p * (1 - p) / n)
= 1.645 * sqrt(0.3744 * (1 - 0.3744) / 390)
= 0.0403
confidence level and sample data to find confidence interval for estimating a population round your answer...
Constructing Confidence Intervals, Part 1: Estimating Proportion
Assume that a sample is used to estimate a population proportion p.
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Assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. Round the margin of error to four decimal places. 90% confidence; n = 480,X = 120 Formula: margin of error = Input: margin of error = Answer:
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