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.
How Effective Is Membrane Stripping for Inducing Labor? Medically reviewed by Debra Sullivan PhD, MSN , CNE,COI on April 7, 2016 â Written by Chaunie Brusie, RN, BSN on April 7, 2016 I was pregnant with my son during one of the hottest summers on record.