A sample of 36 batteries showed an average life of 88.5, Ask an Expert

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"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.

The hypothesis is:
H0: m £ 87
Ha: m > 87
What is the correct conclusion for this hypothesis test?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9117812

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