An inventor has developed a new, energy-efficient lawn mower engine. He claims t

Question

An inventor has developed a new, energy-efficient lawn mower engine. He claims that the engine will run continuously for at least 5 hours (300 minutes) on a single gallon of regular gasoline. From his stock of 2000 engines, the inventor selects a simple random sample of 50 engines for testing. The engines run for an average of 295 minutes, with a standard deviation of 20 minutes. Construct a null and alternate hypothesis that the inventor should use to establish his claim. Based on the sample data, what can he conclude? Use a 0.05 level of significance.

Explanation / Answer

An inventor has developed a new, energy-efficient lawn mower engine. He claims t

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