lesson8-1-1student

# The table below gives a few of the more common

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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...
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