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Owners/operators of franchise of a particular regional pizza chain can earn a six figure income annually....

Owners/operators of franchise of a particular regional pizza chain can earn a six figure income annually. one popular chain (deep dish) reported that their owners/operators averaged $120,000. These incomes had a standard deviation of $40,000. The chain established a program for owners designed to increase the average annual income. Can the chain believe the program was successful if the chain takes a sample of 14 franchise operations and finds that the sample mean income is $142,5000? Use alpha=.10

Math   Statistics-And-Probability   
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