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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.

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.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 4CYU
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**Problem #1** 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 a 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)** Explain how the question in part "a" could be answered by constructing a confidence bound on the mean life.
Transcribed Image Text:**Problem #1** 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 a 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)** Explain how the question in part "a" could be answered by constructing a confidence bound on the mean life.
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