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.
Health related question in topics Addiction Drug Abuse Health .We found some answers as below for this question How long does it take for marijuana to exit your system,you can compare them. For regular marijuana smoker, the marijuana metabolites may stay in the body for between 45 - 90 days. Thanks ChaCha.[ Source: http://www.chacha.com/question/how-long-does-it-take-for-marijuana-to-exit-your-system ].More Answers to  How long does it take for marijuana to exit your system .ow long does it take for marijuana to exit your system. For regular marijuana smoker, the marijuana metabolites may stay in the body for between 45 - 90 days.