selecting a few from a bigger group. disadvantages: estimation or prediction possibility of error! saturation point that is, keep going as long as one keeps discovering new information. keep in mind saturation point is a subjective judgement. Objective: to examine the incidence of childhood obesity in school-aged children in canada. Population / study sample (n) all children between the age of 5 and 11 years. Sample x number of children selected from the study sample. Sampling unit / sampling element if a multi-stage sample, then could be schools, grades selected, and individuals. Sampling frame a list of schools, grades, students. Sample statistics data related to who is obese or not. Population parameters or population mean can only be obtained if all children aged 5 -11 www. notesolution. com are sampled. C and d 24 (-2. 5, -1. 5, 0, 1. 5, 2. 5) Select sample of 2 individuals to estimate average age. Sampling error difference between sample statistics & population mean.