What is the standardized test statistic for the significance test the school administrator wants to perform?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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A school district claims that the mean number of students per class in all of their school is 25 students. The teachers believe that the mean is larger and want to conduct a significance test at the α = 0.05 significance level of

 

Where = the mean number of students per class for all classes in this district. The teachers selected a random sample of 10 of the teachers in the district and asked them how many students they had in their classes. The graph of these data was approximately normal with a sample mean of 27.5 students and the sample standard deviation was 3.85 students. What is the standardized test statistic for the significance test the school administrator wants to perform?

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