"D" Size Batteries Produced by MNM Corporation Have Had a Life

question 62

Essay

"D" size batteries produced by MNM Corporation have had a life expectancy of 87 hours. Because of an improved production process, it is believed that there has been an increase in the life expectancy of its "D" size batteries. A sample of 36 batteries showed an average life of 88.5 hours. Assume from past information that it is known that the standard deviation of the population is 9 hours.
a.Formulate the hypotheses for this problem.
b.Compute the test statistic.
c.What is the p-value associated with the sample results? What is your conclusion based on the p-value? Let $\alpha$ = .05.

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