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The manufacturer of a new product claims that his product will increase output per machine by at least 32 units per hour. A line manager

The manufacturer of a new product claims that his product will increase output per machine

by at least 32 units per hour. A line manager adopts the product on 20 of his machines, and finds that

the average increase was only 30 units per hour with a standard deviation of 12.2 units. Is there evidence

to doubt the manufacturer's claim at a significance level of 0.05?

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