P-value associated with sample results

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Reference no: EM1316436

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 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. Ay 99% confidence using the critical value approach, test management's belief.

b. What is the p-value associated with the sample results? What is your conclusion based on the p- value?

Reference no: EM1316436

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