Amir supervised a clinical trial for a diabetic drug in 2081 human volunteers. He recorded the levels of glucose before and after the drug treatment. The null hypothesis is that there is no difference in the mean glucose level before and after drug treatment.

a) If he wants to calculate the significance of the observation using t-test, does he need to choose paired or unpaired or not needed?

Answer

a) In t-test, what will he use?

One tail

Two tail

Three tail

All of the above