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A producer of various kinds of batteries has been producing "D" size batteries with a life...

A producer of various kinds of batteries has been producing "D" size batteries with a life expectancy of 87 hours. Due to an improved production process, management believes that there has been an increase in the life expectancy of their "D" size batteries. A sample of 40 batteries showed a sample mean life of 90.5 hours. assume that the population standard deviation is known to be 9 hours. Test at a 5% level of significance to see if there is evidence that the mean life of "D" batteries has increased. What is your Conclusion? SHOW ALL WORK and PLEASE MAKE LEGIBLE

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