T-statistics

#1
Hi,

I am trying to calculate t -statistics (formula below). I am not sure if I need to use a one-tail or two-tail test. I have attached an excel sheet with the calculation (i used t.inv.2t - line q25).

The issue is; I am not getting the expected value which is 0.113976896 (the value I am getting is 0.131208542287959).




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