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The average life of a certain type of small motor is 10 years with a standard deviation of 2 years. Assume that the lifetime of

The average life of a certain type of small motor is 10 years with a standard deviation of 2 years. Assume that the lifetime of a motor follows a normal distribution.

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c. (10 points) A random sample of 9 motors is tested by a researcher, and the average life is found to be r = 9 years. Do we have reason to believe that the average life is different than 10 years? Use level of significance a = 0.05. Present all the five steps of a HTP

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