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 System. How long marijuana stays in your system depends on a variety of factors. How often you smoke, your rate of metabolism, and your general health and weight all have an effect on how long it takes before marijuana is out of your system.