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 lisinopril stay in your system? Lisinopril remains active in the body for 24 hours, states Drugs.com. The drug has a half-life of 12 hours, meaning that half of the dose is absorbed in the first 12 hours after it is taken. The drug is eliminated from the body in urine.