EARTHSC 3MB3 Lecture Notes - Lecture 7: Stratified Sampling, Sampling Frame, Infant Mortality
27 Sep 2016
School
Department
Course
Professor
Document Summary
Quiz 3 question #5: calculate the standard deviation. The answer is 3 because around 68 percent of the observations fall within it. Sampling is a chosen subset of a population. Collect data from the sample and use these data to calculate statistics. Sampling fundamentals: sampling unit, sampling frame, sampling method. Sampling unit-the subject/item/thing that you are sampling or want to measure (ex. person, location, moment in time, object: ex. Countries (context dependent, in practice we won"t ask all individuals) Sampling frame-target population in which you are drawing your sample (the broader the research question, the broader the population: ex. Not really sampling" since the entire sampling frame is selected: simple random sampling (srs) Every sampling unit in the sampling frame is equally likely to be included in the sample, equal probability (such as putting everyone"s name in the hat once: making it random. Physical system (ex. drawing names from a hat)
