The T-Score Formula. The t-score is a fraction. The numerator is the sample's mean minus mean of the group you are comparing the sample to, and the denominator is the sample's standard deviation divided by the square root of the sample size.
If you have smoked marijuana then the drug will stay for 3 to 30 days. This is normal for the common drugs. But in the case of marijuana, this can be detected even after a month in Urine drug test marijuana. Marijuana will stay in your system for 10 days if you have been smoking occasionally.
Depending on your body size marijuana can stay in your system from 15 to 45 days. Also if you sweat or urinate frequently it can clear out your system faster. However the one set amount of time that is just about 98 % true is 30 days for the average sized person.. I'm sorry but do NOT listen to this poster.