I Paired t test

  • Thread starter lamlam1
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Using paired t test, how should I pair these results?
To calculate the delta values, should I use: downstream - upstream for both sep and apr ?
or upstream (sep) - upstream (apr) and downstream (sep) - downstream (apr) ?

Thanks
 

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What is the quantity that you want to test and which pairing gives you that quantity?
 

WWGD

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How do you get a net pollution value? Is there a typo on increasing pollution? Shouldn't it be lowering pollution?
 

BWV

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View attachment 240043

Using paired t test, how should I pair these results?
To calculate the delta values, should I use: downstream - upstream for both sep and apr ?
or upstream (sep) - upstream (apr) and downstream (sep) - downstream (apr) ?

Thanks
Only the delta for the same day makes sense as the concern is an upper limit of 4 mg/L increase. Not sure why comparing April and Sep as two populations is relevant, seems to me a one tailed t-test on the delta with a null hypothesis that the mean of the delta >4 would be the relevant test
 

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