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1PropZInt - Using Your TI-83/84 Calculator Estimating a...

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Using Your TI-83/84 Calculator: Estimating a Population Proportion Dr. Laura Schultz The 1-PropZInt command is used to construct a confidence-interval estimate of a population proportion ( p ) or percentage. 1. Press and use ~ to scroll right to the TESTS menu. 2. Scroll down to A:1-PropZInt and press Í . 3. Your calculator will prompt you for the following information: x: This is the number of “successes.” Note that x must be a whole number . You will get a domain error message if you don't enter a whole number here; no decimals are allowed. If you are given the sample proportion ˆ p instead of x , keep in mind that x = n · ˆ p , and remember to round x to the nearest whole number. A trick that I use is to enter n · ˆ p on the input line for x , and then scroll back up and round the answer as needed. n: This is the number of trials. When working with the results of a public opinion poll, n will correspond to the number of people surveyed. C-Level: This is where you specify the confidence level. Note that you must enter the confidence level in decimal form. For example, enter 0.95 if you want to find a 95% confidence interval.
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