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Medical researchers have developed a new artificial heart
Chapter 9, Problem 49E(choose chapter or problem)
Medical researchers have developed a new artificial heart constructed primarily of titanium and plastic. The heart will last and operate almost indefinitely once it is implanted in the patient's body, but the battery pack needs to be recharged about every four hours. A random sample of 50 battery packs is selected and subjected to a life test. The average life of these batteries is hours. Assume that battery life is normally distributed with standard deviation \(\sigma=0.2\) hour.
(a) Is there evidence to support the claim that mean battery life exceeds 4 hours? Use \(\alpha=0.05\).
(b) What is the P-value for the test in part (a)?
(c) Compute the power of the test if the true mean battery life is hours.
(d) What sample size would be required to detect a true mean battery life of hours if you wanted the power of the test to be at least ?
(e) Explain how the question in part (a) could be answered by constructing a one-sided confidence bound on the mean life.
Equation Transcription:
Text Transcription:
sigma=0.2
alpha=0.05
Questions & Answers
QUESTION:
Medical researchers have developed a new artificial heart constructed primarily of titanium and plastic. The heart will last and operate almost indefinitely once it is implanted in the patient's body, but the battery pack needs to be recharged about every four hours. A random sample of 50 battery packs is selected and subjected to a life test. The average life of these batteries is hours. Assume that battery life is normally distributed with standard deviation \(\sigma=0.2\) hour.
(a) Is there evidence to support the claim that mean battery life exceeds 4 hours? Use \(\alpha=0.05\).
(b) What is the P-value for the test in part (a)?
(c) Compute the power of the test if the true mean battery life is hours.
(d) What sample size would be required to detect a true mean battery life of hours if you wanted the power of the test to be at least ?
(e) Explain how the question in part (a) could be answered by constructing a one-sided confidence bound on the mean life.
Equation Transcription:
Text Transcription:
sigma=0.2
alpha=0.05
ANSWER:
Step 1 of 5
Given,
Sample size, n = 70
The sample mean,
The standard deviation,
Using the given values let’s determine the following: