An initial survey was performed right after Médecins Sans Frontières accused my

Question

An initial survey was performed right after Médecins Sans Frontières accused my brother of wrong doing. Of 1852 customers, 53 were against the aggressive tactics of Médecins Sans Frontières. After my brother was cleared by the court, a follow-up survey was performed. Of 4699 customers, 1751 said they did not agree with the aggressive tactics of Médecins Sans Frontières. At the 1% significance level, do the data suggest that a higher percentage of customers were against Médecins Sans Frontières after the court case?

Explanation / Answer

Po = 53 / 1852 = 0.0286

Ho : Po = 0.0286

Ha : Po > 0.0286

P = 1751 / 4699 = 0.37

Z = ( 0.37 - 0.0286 ) / srqt ( 0.0286*0.9714 / 4699 )

Z= 140.00

since Z very high we reject Hoi

conclusion there is higher percentage of

customers were against Médecins Sans Frontières after the court case

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