a study showed that 64% of supermarket shoppers believed supermarket brand to be

Question

a study showed that 64% of supermarket shoppers believed supermarket brand to be as good as national name rands in terms of product quality.  To investigate as to whether this result applies to its own products, tha manufacturer of a national name brand ketchup product asked 100  super market shoppers whether they believed the supermarket brand was as good as the national brand (52 of he sample said yes).  The neational brand manufacturer believes that less tha 64% will agree that the supermarket rand was good.  Test the manufactures's claim at a=0.05

Explanation / Answer

p=0.64, p-hat=52/100=0.52 =0.05, Z(0.05)=1.645 (check normal table) The test hypothesis is Ho:p>=0.64 Ha:p

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