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Author Question: A producer of various kinds of batteries has been producing "D" size batteries with a life ... (Read 26 times)

madimontg

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on: Mar 25, 2023

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.

Give the null and the alternative hypotheses.

b.

Compute the test statistic.

c.

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

d.

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

Essentials of Statistics for Business and Economics ¦ Anderson, Sweeney, Williams, Camm, Cochran ¦ 7th Edition
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Marked as best answer by madimontg on Mar 25, 2023

jojo120419

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Reply #1 on: Mar 25, 2023
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madimontg

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Reply 2 on: Mar 25, 2023
Wow, this really help

epscape

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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