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.
A lot of people find it surprising that drug examiners can test your hair to know if you used and ingested drugs within the last 90 days from many drug substances. Here is the detail list of how long different kinds of drugs stay in your system for. Alcohol for stays for about two days at the most.Meth can stay in your system for the maximum of 3 days. Cocaine can be found in your system using urine test with the 5 days of use.LSD and Heroin can also be detected through urine and blood test within a time period of 3 to 4 days depending on how often you used.allucinogenic mushrooms stay in your system 1-3 days, depending on what kind, and how much you took. Typically you want to stay away from these drugs. But if you already used it and now regretting it, probably you will be ok from now on.