Photo by: Alila. Exocytosis is the cellular process in which intracellular vesicles in the cytoplasm fuse with the plasma membrane and release or secrete their contents into the extracellular space.
More generally, the formula for the 95% confidence interval on the mean is: Lower limit = M - (tCL)(sM) Upper limit = M + (tCL)(sM) where M is the sample mean, tCL is the t for the confidence level desired (0.95 in the above example), and sM is the estimated standard error of the mean.
The upper limit is set with the valve wide open and the lower limit is chosen so that any measurement taken at the valve will have a tolerance of no greater than +/- 5%. If the flow rate desired falls within the range of two different size valves, chose the smaller of the two valves.