A person wants to know if the proportion of the people in Dubai who commutes to work by public transportation is on the rise. What size sample should be obtained if the person wants an estimate within 2 percentage points of the true proportion with 90% confidence if a. the person uses the 2010 estimate 10.7% obtained from a previous survey, b. the person does not use any prior estimate

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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A person wants to know if the proportion of the people in Dubai who commutes to work by public transportation is on the rise. What size sample should be obtained if the person wants an estimate within 2 percentage points of the true proportion with 90% confidence if
a. the person uses the 2010 estimate 10.7% obtained from a previous survey,
b. the person does not use any prior estimate

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