This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Using Your TI83/84 Calculator: Estimating a Population Proportion Dr. Laura Schultz The 1PropZInt command is used to construct a confidenceinterval estimate of a population proportion ( p ) or percentage. 1. Press … and use ~ to scroll right to the TESTS menu. 2. Scroll down to A:1PropZInt 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. CLevel: 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....
View
Full
Document
This note was uploaded on 10/05/2008 for the course MA 120 taught by Professor Jerome during the Fall '07 term at Park.
 Fall '07
 Jerome
 Statistics

Click to edit the document details