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.
1 For occasional users, marijuana can usually be detectable anywhere from 7-21 days in the system after last use. 2  For regular users, marijuana can stay detectable anywhere from 23-35 days or longer, depending on the frequency of use. Marijuana can stay in your system for any amount of time, ranging from a few hours to well over a month or two or six, yes six month. The duration depends on several factors, such as frequency of use, potency of the marijuana, and the unique composition of the userâs system and metabolism.