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The owner of a machine shop must decide which of two snack vending machines to install in his shop If each is tested 250 times,

The owner of a machine shop must decide which of two snack vending machines to

install in his shop If each is tested 250 times, the first machine fails to work 13 times and

the second machine fails to work 7 times Test at the 0.05 level of significance whether the difference between the corresponding sample proportions is significant

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