The standard deviation of a random variable, statistical population, data set, or probability distribution is the square root of its variance. It is algebraically simpler, though in practice less robust, than the average absolute deviation.he variance is the mean of these values: and the population standard deviation is equal to the square root of the variance: This formula is valid only if the eight values with which we began form the complete population.
Report Abuse. 1  Sounds like the sweep worked. You will typically go into labor within 24-48 hours if a membrane sweep worked. 2  For some it doesn't work at all - if its going to work usually within 24hrs you are in labor. Invisible Pink RN Â· 7 years ago.
If your healthcare provider prescribes MoviPrepÂ® (polyethylene glycol electrolyte solution) to cleanse your bowels before a colonoscopy, you may be wondering how long it will take for the laxative to work. MoviPrep typically causes the first bowel movement within about one hour after drinking your first dose. MoviPrep is taken either the night before a colonoscopy or split up between the night before and the morning of the procedure. Your healthcare provider will tell you which dosing regimen you should follow.