General Motors, the largest auto producer in this country, produces and sells its cars under five different brand names. Some of the cars sold under different names can be considered “sister cars” that should turn in the same performance.

An auto analyst wants to see whether the “sister cars” sold under different names do indeed have the same performance. He tested 20 cars from three different brands and recorded the mileages per gallon. Do the data require rejection of the null hypothesis that the mileages per gallon generated by three

“sister cars” are the same? Do a 5 % test.

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Brand A C