The table below gives a few of the more common

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 645 standard deviations of the population mean? 11 What percent of sample proportions will be within 1.645 standard errors of the population proportion? © 2011 THE CARNEGIE FOUNDATION FOR THE ADVANCEMENT OF TEACHING A PATHWAY THROUGH STATISTICS, VERSION 1.6, STATWAY™  ­ STUDENT HANDOUT STATWAY STUDENT HANDOUT | 4 Lesson 8.1.1 Intervals for a Population Proportion and the Normal Distribution Critical Values Since 90% of the area under the standard normal curve is between –1.645 and 1.645, the critical value for a 90% level of confidence is Zc = 1.645. Other levels of confidence have their own corresponding critical values, each capturing their respective percentages under the standard normal distribution. The table below gives a few of the more common critical values. Confidence Level Critical Value !! = 1.645 0.90 !! = 1.960 0.95 !! = 2.576 0.99 The figure below graphically depicts these critical values, and the respective areas captured between each critical value and its negative. 99% Confidence 95% Confidence 90% Confidence 2% 2.57...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online