Ships arriving in U.S. ports are inspected by Customs officials for contaminated cargo. Assume, for a certain port, 20%

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Ships Arriving In U S Ports Are Inspected By Customs Officials For Contaminated Cargo Assume For A Certain Port 20 1 (31.63 KiB) Viewed 28 times

Ships arriving in U.S. ports are inspected by Customs officials for contaminated cargo. Assume, for a certain port, 20% of the ships arriving in the previous year contained cargo that was contaminated. A random selection of 50 ships in the current year included 5 that had contaminated cargo. Does the data suggest that the proportion of ships arriving in the port with contaminated cargoes has decreased in the current year? What is the appropriate test to perform? O z-test about mean. Ho:p>20 versus Ha: u=20 Oz-test about mean. Ho: p=20 versus Ha:u=20 O z-test about mean. Ho: p=20 versus Ha: u<20 Oz-test about proportion. Ho: p= 2 versus Ha:p>.2 O z-test about proportion. Ho: p= 2 versus Ha:p< 2 Oz-test about mean. Ho: u=20 versus Ha:p>20 O z-test about proportion. Ho: p= 2 versus Ha: p7.2 Oz-test about proportion. Ho:p>.2 versus Ha: p= 2