SOLVED: "D" size batteries produced by MNM Corporation have had a lifeexpectancy of 87 hours. Because of an improved production process,the company believes that there has been an INCREASE in the lifeexpectancy of its D size batteries. A sample of 36 batteries showedan average life of 88.5 hours. Assume from past information that itis known that the standard deviation of the population is 9hours.Use a 0.01 level of significance, and test to determine if therehas been an increase in the life expe

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