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An economist wants to know if the proportion of the U.S. population who commutes to work via carpooling is on the rise. What size sample should be obtained if the economist wants an estimate within 2 percentage points of the true proportion with 90% confidence if: (a) the economist uses the 2009 estimate of 10% obtained from the American Community Survey? Answer: a= | Za/2 (Round to three decimal places)= Sample Size= E= Answer: Sample Size= (b) the economist does not use any prior estimates? Sample Proportion= (Round up to the nearest integer.) (Round up to the nearest integer.)

An economist wants to know if the proportion of the U.S. population who commutes to work via carpooling is on the rise. What size sample should be obtained if the economist wants an estimate within 2 percentage points of the true proportion with 90% confidence if: (a) the economist uses the 2009 estimate of 10% obtained from the American Community Survey? Answer: a= | Za/2 (Round to three decimal places)= Sample Size= E= Answer: Sample Size= (b) the economist does not use any prior estimates? Sample Proportion= (Round up to the nearest integer.) (Round up to the nearest integer.)

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 1GP
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An economist wants to know if the proportion of the U.S. population who commutes to work via carpooling is on the rise. What size sample should be obtained if the economist wants an estimate within 2 percentage points of the true proportion with 90% confidence if: (a) the economist uses the 2009 estimate of 10% obtained from the American Community Survey? Answer: a= | Za/2 (Round to three decimal places)= Sample Size= , E= Answer: Sample Size= (b) the economist does not use any prior estimates? , Sample Proportion= (Round up to the nearest integer.) (Round up to the nearest integer.)
Transcribed Image Text:An economist wants to know if the proportion of the U.S. population who commutes to work via carpooling is on the rise. What size sample should be obtained if the economist wants an estimate within 2 percentage points of the true proportion with 90% confidence if: (a) the economist uses the 2009 estimate of 10% obtained from the American Community Survey? Answer: a= | Za/2 (Round to three decimal places)= Sample Size= , E= Answer: Sample Size= (b) the economist does not use any prior estimates? , Sample Proportion= (Round up to the nearest integer.) (Round up to the nearest integer.)
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