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.
I was told by a pharmacist that valium and temazepam stay in the system for urine testing 4-5 days, please advise. Expert: nurse_Dan replied 8 years ago. I have mis-spoke the information. If you have been taking valium medication for a lot times months to years the time to clear your urine is 1 to 4 weeks.xpert: nurse_Dan replied 8 years ago. If you are having a drug test valium is not a good drug to have in your system. It has a very long half life and can stay in your system up to 30 days.