6 The useful lifetime of Ecrlasts1vol battery is a normally

6. The useful lifetime of Ecrlast\'s1vol battery is a normally distributed random variable with mean 40 hours and variance 16 hours. A new chemical composition is introduced to make the production of the batteries more efficient. The company wants to see if the useful life of the battery has been affected (increased or decreased) by the new process. A sample of 100 batteries has been selected for analysis. a) What hypotheses should be tested? (8 points)

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