A poll taken before an election finds that 42 of 80 people asked favored the incumbent...

A poll taken before an election finds that 42 of 80 people asked favored the incumbent candidate. What is the 99% confidence interval for the proportion of voters that favor the incumbent?

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Expert Solution

Here to compute the Confidence Interval for population proportion we have to use z distribution i.e sampling Distribution for sample proportion as below,

The formula for 99% Confidence Interval for population proportion is given below,

The z critical value is calculated using Standerd normal z-table or using Excel.

The 99% Confidence Interval for population proportion is 38.1% & 66.9%.

Thank you.

orchestra answered 1 year ago

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