Since the number of samples is less than 30, shouldn't t-test be used instead

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Since the number of samples is less than 30, shouldn't t-test be used instead?

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A new system is introduced and 10 hammer samples are drawn. Since the no. of samples is < 30, t-test must have been used. Please correct me if this interpretataion is wrong

 

According to this flowchart, t-test must be used when the sample size is less than 30.

YES
YES
Is the sample
size above 30?
Use the Z-Test
Do you know the
population standard
deviation,σ,?
NO
Use the T-Test
NO
Use the T-Test
Transcribed Image Text:YES YES Is the sample size above 30? Use the Z-Test Do you know the population standard deviation,σ,? NO Use the T-Test NO Use the T-Test
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