In 35 of their stores they sold on the average 430 suits, Ask an Expert

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An averaged department store sells 350 mens suits per year. The mens suit departments at a particular national chain of stores claim they sell more than the industry average. In 35 of their stores they sold on the average 430 suits per year with a population standard deviation of 40. What is the test value for their claim?

a) 0.34
b) 2.00
c) 6.92
d) 11.83

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