I used t-test to compare the means of two groups, one was a test group (n=400) and the other was randomly selected (n=400) to used as control. The variable measured was numeric but the distribution was unknown.

Hence, I was told to do multiple sampling instead. That is, randomly select group of the same size as the test group (n=400) and calculate its mean, then, repeat this step 1,000 times to form a baseline (of 1,000 means).

Next, I was told to use this baseline to challenge the earlier test group. If the group is in, let's say, the third place within the baseline, than the p value is 0.003.

My question is, how do I report this process in my paper ? What is the statistical test done here ?

Other relevant comments are welcomed as well.

Thanks