ENVS278 Midterm: ENVS278 MIDTERM
6 Oct 2016
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Document Summary
Concept s b r p q (populations) p. Chapter 5: the standard deviation as a ruler and the normal model. The probability that n random events will occur is given by the product of the individuals probabilities of each event. P(x)= p(1) x p(2) x x p(n) About how we gather data to answer some question about a population, without having to ask every person, or measure every atom. Multistage sampling: combines srs, stratified and/or cluster sampling, very common, instead of completing a census of the strata or the cluster we can use srs to randomly select individuals from each to represent the population. Systematic sampling: selecting individuals systematically (eg. every 5th person on an alphabetical list is selected) Types of variables: independent/explanatory: the one thing you change throughout the experiment, dependent/response: the change that happens because of the independent variable, controlled: everything you want to remain constant and unchanging.
