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.
The half-life of clonazepam (Klonopin) is about 30 hours. If you only take one dose, the general rule is the medication will statistically be out of your system after 5 half-lives, when only 3.125% of the drug remains in the body. This would mean that clonazepam will be out of your system after about 150 hours, but this can change based on your specific enzymes.