How to use two -tail t-test?
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Weiyan Chen
il 23 Ott 2016
Commentato: Star Strider
il 23 Ott 2016
I have two set of data (x and y)and I want to show that x is bigger than y by using the two-tail t-test. I know that the if I want to check the tail I need to type 'Tail','right','left', or 'both'. But I do not understand how to show this.
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Star Strider
il 23 Ott 2016
If your hypothesis is ‘greater than’ or ‘less than’, use a one-tailed test. If your hypothesis is ‘different than’, use a two-tailed test.
The way to code it (for ttest2), is for example to test that the mean of ‘x’ is less than the mean of ‘y’:
[h,p,ci,stats] = ttest2(x, y, 'Tail','left');
Examine your data and consult the documentation to determine the correct option.
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Star Strider
il 23 Ott 2016
Yes!
You are exactly correct in the context of the syntax I posted, with ‘x’ as the first argument and ‘y’ the second.
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