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A sporting goods store believes the average age of its customers is 39 or less. A random sample of 43 customers was surveyed, and the

A sporting goods store believes the average age of its customers is 39 or less. A random sample of 43 customers was surveyed, and the average customer age was found to be 42.1. Assume the standard deviation for customer age is 9.0 years > Using alpha =.05 complete parts a and b

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