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A mobile company is innovating a new mobile phone and is interested how long it will take for a battery to charge fully. The standard deviation is known to be 15 minutes. The company wishes to test if the mean charging time is at most 30 minutes compared to the claim that it is more than 30 minutes. A random sample: of 35 mobile phones was selected and a mean charging time is more than 35 minutes. Can it be concluded that the mean charging time is not at most 30 minutes if the critical region is greater than 35 minutes?

A mobile company is innovating a new mobile phone and is interested how long it will take for a battery to charge fully. The standard deviation is known to be 15 minutes. The company wishes to test if the mean charging time is at most 30 minutes compared to the claim that it is more than 30 minutes. A random sample: of 35 mobile phones was selected and a mean charging time is more than 35 minutes. Can it be concluded that the mean charging time is not at most 30 minutes if the critical region is greater than 35 minutes?

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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A mobile company is innovating a new mobile phone and is interested how long it will take for a battery to charge fully. The standard deviation is known to be 15 minutes. The company wishes to test if the mean charging time is at most 30 minutes compared to the claim that it is more than 30 minutes. A random sample: of 35 mobile phones was selected and a mean charging time is more than 35 minutes. Can it be concluded that the mean charging time is not at most 30 minutes if the critical region is greater than 35 minutes?
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