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The manufacturer of a certain brand of auto batteries claims that the mean lifè of these batteries is 40 months. A consumer protection agency that wants to check this claim took a random sample of 24 such batteries and found that the mean life for this sample is 42 months. The lives of all such batteries have a population standard deviation of 4.5 months. Perform a hypothesis test at 10% significance level and state your decision using critical value approach.

The manufacturer of a certain brand of auto batteries claims that the mean lifè of these batteries is 40 months. A consumer protection agency that wants to check this claim took a random sample of 24 such batteries and found that the mean life for this sample is 42 months. The lives of all such batteries have a population standard deviation of 4.5 months. Perform a hypothesis test at 10% significance level and state your decision using critical value approach.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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The manufacturer of a certain brand of auto batteries claims that the mean lifè of these batteries is 40 months. A consumer protection agency that wants to check this claim took a random sample of 24 such batteries and found that the mean life for this sample is 42 mnonths. The lives of all such batteries have a population standard deviation of 4.5 months. Perform a hypothesis test at 10% significance level and state your decision using critical value approach.
Transcribed Image Text:The manufacturer of a certain brand of auto batteries claims that the mean lifè of these batteries is 40 months. A consumer protection agency that wants to check this claim took a random sample of 24 such batteries and found that the mean life for this sample is 42 mnonths. The lives of all such batteries have a population standard deviation of 4.5 months. Perform a hypothesis test at 10% significance level and state your decision using critical value approach.
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