To do testing of new car products, the owner of Mr Landcruiser measures car performance before and
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Question:
To do testing of new car products, the owner of Mr Landcruiser measures car performance before and after a new product is fitted. Mr Landcruiser is testing the new 3 inch exhaust product. For a random sample of 5 Landcruiser's, the horse power is shown before and after the exhaust is fitted:
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