The ratio of mean to standard deviation can be related to formal tests of statistical significance and confidence intervals, if the individual model results were to be considered a sample. (ipcc.ch)
Most vaccines are actually labeled for use in animals older than 6 weeks, which means they went through formal testing to prove efficacy and safety only in animals of this age or older. (aspcapro.org)
In general, clinical interviews are more open and less structured than formal testing because this part of the evaluation allows for the client to convey information and experiences in their own words. (equilibriapcs.com)