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.
http://boards.cannabis.com/cannabis-com-lounge/30861-how-long-does-one-hit-weed-stay-your-system.html. No it doesn't. the Cannabinoids stay in your body for up to a month. If you took a single hit a week ago it may still be in your body but might not even be detectable.arijuana can stay in the system for as little as 36 hours, but as long as 3 months depending on your body's metabolism. ChaCha! [ Source: http://www.chacha.com/question/how-long-does-one-hit-of-weed-stay-in-your-system ].