Medical researchers have devel indefinitely once it is implanted in battery packs is selected and su distributed with standard deviatic What is the test statistic for the t

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.CR: Chapter 13 Review
Problem 58CR
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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 4.05 hours. Assume that battery life is normally
distributed with standard deviation o= 0.2 hour. Is there evidence to support the claim that mean battery life exceeds 4 hours? Use a= 0.05.
What is the test statistic for the test? Answer rounded-off to 2 decimal places
Transcribed Image Text: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 4.05 hours. Assume that battery life is normally distributed with standard deviation o= 0.2 hour. Is there evidence to support the claim that mean battery life exceeds 4 hours? Use a= 0.05. What is the test statistic for the test? Answer rounded-off to 2 decimal places
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