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.
How long does marijuana stay in your urine if you smoked everyday for years? It will stay for 30 days. If you use water and Cranberry juice these will help remove it from your system faster, but it would still be wise to wait for the full 30 days befor â¦ e you take a drug test.