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.
Head Start. Sensory Screening Protocol. As mandated by the Head Start Program Performance Standards, screenings must be completed within 45 days of enrollment. The Sensory Screening Protocol developed by Region 1, offers a series of tasks to effectively screen children.