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lesson8-1-1student

# this interval represents all values between

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Unformatted text preview: Error Using the critical values from the normal distribution, the margin of error in a sample proportion is ! = !! ⋅ !! where the proportion of the normal distribution contained between – Zc and Zc is equal to the level of confidence. Using the estimated standard error in place of !! gives a new formula for the margin of error, ! = !! ⋅ ! 1−! . ! Summary: Computing a Confidence Interval for a Population Proportion  Verify that the random sample has at least 10 successes and 10 failures.  Determine the critical value, Zc, corresponding to the chosen level of confidence.  Compute the margin of error, ! = !! ⋅  ! 1−! ! Compute the confidence interval. This is often represented as statistic ± E, where our statistic is the sample proportion, !. ! ± ! Often, we express confidence intervals in interval notation. An interval, expressed as ! , ! , is the set of all values between a and b. When we use interval...
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