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.
Answers. Best Answer: Benzodiazepines stay in your system for 30 days or more. If you had an RX for it you would be OK, but if not then you will test positive. Try to drink a crapload of water and cranberry juice and try to pass it...All the drugs like Xanax, Valium etc. have a half life of 12 hours, meaning half of the drug is gone in 12 hours, but the rest stays in your system for 30 days.Source(s): âBTriXâ Â· 9 years ago.ll the drugs like Xanax, Valium etc. have a half life of 12 hours, meaning half of the drug is gone in 12 hours, but the rest stays in your system for 30 days. Source(s): âBTriXâ Â· 9 years ago.