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 Lorazepam stay in hair? Lorazepam can be detected in hair up to 90 days after the drug was first taken. The length of the personâs hair at the time of testing, as well as hair color or color treatments can affect the accuracy of the results. Traces of Lorazepam can be found in urine for at perhaps a day or two.