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"D" size batteries produced by MNM Corporation have had a life expectancy of 87 hours. Because...

"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 and a (sample) standard deviation of 4 hours.

a. The correct null hypothesis for this problem is   

b. Compute the test statistic.   

c. At 95% confidence using the critical value approach, the critical value is                           

d. What is your conclusion?

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