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A battery pack used in a medical device needs to be recharged about every 5 hours....

A battery pack used in a medical device needs to be recharged about every 5 hours. A random sample of 60 battery packs is selected and subjected to a life test. The average life of these batteries is 5.05 hours. Assume that battery life is normally distributed with standard deviation ? = 0.3 hours. Is there evidence to support the claim that mean battery life is not 5 hours? Use ? = 0.01.

a. Use P-value approach to test the hypothesis.

b. Use z-test to test the hypothesis.

c. Use confidence interval to test the hypothesis.

d. If the true mean life is 4.8 hours, what is the type II error?

e. If the true mean life is 4.8 hours, what is the minimum sample size needed to recognize it with 95% probability?

Math   Statistics-And-Probability   
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