A manufacturer of brake pads claims that its plugs have an a

A manufacturer of brake pads claims that its plugs have an average life in excess of 32,000 miles. A consumer magazine would like to perform a hypothesis test to see whether the actual performance is different than stated. They contacted a fleet owner who purchased 18 sets and found that the sample average life was 34,590 miles, the sample standard deviation was 4,250 miles. Conduct a hypothesis at the.05 level to test the hypothesis. Be sure to state your conclusion in context

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