[See Solution] You wish to test the average life of the new Never-Ready batteries. According to Batteries Digest, the standard deviation of their lifespan
Question: You wish to test the average life of the new Never-Ready batteries. According to Batteries Digest, the standard deviation of their lifespan is 8 hours.
- Assuming a normal distribution, how many batteries would you have to test to be 99% confident of the average life with a tolerable error of 2 hours?
- Given that the suggested sample size was used, how large would you expect the 99% confidence interval to be?
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Solution: During the month of December, a sample of 75 Hallmark
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