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.
Rating Newest Oldest. Best Answer: No, it should not show up on a urine drug screen if it has been two months since you last consumed this drug. The typical rule of thumb for the group of drugs known as Benzodiazipines (which include Xanax, Valuim, Klonipin, etc.) is thirty days to clear the urine.