Statistical Education Resource Kit

Confidence Intervals

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Table of Contents

Confidence Intervals

The Tattoo Data

General Objective

95% Confidence Interval Estimate

Confidence Level for Interval

Interval for a proportion 

Formula For SD

For the tattoo data

Same Survey Last Spring

Confidence Interval Based on Last Spring

Comparison

Margin of Error

Gallup Poll Question

Interpretation

Some Warnings

 Author: Bob Heckard

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This web page was submitted by Bob Heckard: rho@stat.psu.edu