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.
First of allâyouâre dates on how long drugs stay in your system are incorrect. It can take up to 4-5 days for methamphetamines to get out of your system EVEN if you are not a heavy user. If you do a 1.5grams in one day, you could still be positive in 4-5 days.