The manufacturer of a battery claims that the mean life of it is 8 months. An agency took a sample of 40 such batteries with a mean life of 7 months and a standard deviation of 2.25 month. Using 10% significance level, is there sufficient evidence to reject the claim?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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The manufacturer of a battery claims that the mean life of it is 8 months. An agency took a sample of 40 such batteries with a mean life of 7 months and a standard deviation of 2.25 month. Using 10% significance level, is there sufficient evidence to reject the claim?
Activity 2: "YOU COMPLETE MEI V2"
Problem 2: The manufacturer of a battery claims that the mean life of it is 8 months. An agency
took a sample of 40 such batteries with a mean life of 7 months and a standard deviation of
2.25 month. Using 10% significance level, is there sufficient evidence to reject the claim?
Solution:
Step 1. Hai.
Ha:
Step 4. Since a =,
and it is
the critical values are Za/2 =.
Step 2. a =
test
Step 3. Test – statistic
Given: T=.
Step 5. Decision/Conclusion:
Transcribed Image Text:Activity 2: "YOU COMPLETE MEI V2" Problem 2: The manufacturer of a battery claims that the mean life of it is 8 months. An agency took a sample of 40 such batteries with a mean life of 7 months and a standard deviation of 2.25 month. Using 10% significance level, is there sufficient evidence to reject the claim? Solution: Step 1. Hai. Ha: Step 4. Since a =, and it is the critical values are Za/2 =. Step 2. a = test Step 3. Test – statistic Given: T=. Step 5. Decision/Conclusion:
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