Mathematics, 05.11.2020 19:00, oreo543

An automobile manufacturer claims that their van has a 46.4 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van. After testing 140 vans they found a mean MPG of 46.0. Assume the standard deviation is known to be 2.6. Is there sufficient evidence at the 0.02 level that the vans underperform the manufacturer's MPG rating?

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An automobile manufacturer claims that their van has a 46.4 miles/gallon (MPG) rating. An independen...