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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 increasein the life expectancy of their "D" size batteries. A sample of 36 batteries showed an average life of 88.5 hours. It is known that the standard deviation of the population is 9 hours.

a.

 Give the null and the alternative hypotheses
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