A researcher wishes to estimate the number of households with two cars. How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 2% ? A previous study indicates that the proportion of households with two cars is 21%. OA. 1,123 OB. 680 OC. 2 OD. 1,421

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter34: Customary Micrometers
Section: Chapter Questions
Problem 54A
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A researcher wishes to estimate the number of households with two cars. How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 2%? A previous study indicates that
the proportion of households with two cars is 21%.
O
A. 1,123
B. 680
OC. 2
O D. 1,421
Transcribed Image Text:A researcher wishes to estimate the number of households with two cars. How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 2%? A previous study indicates that the proportion of households with two cars is 21%. O A. 1,123 B. 680 OC. 2 O D. 1,421
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