Drugs testing, which t test

willmoore21

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Jan 26, 2012
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I am doing an investigation into the effects of drug X on 20 patients. I have the results of their test scores for before and after their dosage.

My H0: There is an effect of the drug
vs H1: No effect

What t-test do I use? I think my test statistic is

t= [x1(bar) - x2(bar)] / s.e.[x1(bar) - x2(bar)] where the s.e. is sqrt[(s12/n1) +(s22/n2)] where n is the number of patients in each sample (in this case 20 for each), and s2 are the sample variances

and my t value is t~t(n1+n2-2), just to clarify, using this test makes the assumption that the population variances are the same.

Is this the correct t-test to use?
 
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