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.
Hey, I think how long Ritalin stay in your system depends on few factors such as your liver and kidneys functions. However, the half-life of a typical form of Ritalin is generally said to be somewhere between two to four hours. So this drug will be out of your system in less than a day.lcohol 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.