Statistics 101 by David Borman

Author:David Borman
Language: eng
Format: epub, mobi
Publisher: Adams Media

Associated z-Scores

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The associated z-scores for computing margins of errors are: 10 percent − 1.65; 5 percent − 1.96; 1 percent 2.58.

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The confidence interval is then computed as p ± ME = p ± pzσρ =

p ± z . In the case of the Chicagoans who never take a vacation, let’s assume for the sake of this exercise, that 1,000 people

are surveyed. The confidence interval for their result is .73 ± 1.96 giving the interval from 70.25 percent to 75.75 percent.

THE 90–95–99 FACTOR

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