SPAN 101 Chapter Notes - Chapter 3: Sampling Frame, Stratified Sampling, Simple Random Sample
Document Summary
Sample survey: designed to ask questions of a small group of people in the hope of learning something about the entire population. Idea 1: examine a part of the whole: a sample selected form the population. Idea 3: the sample size is what matters the size of the sample determines the data regardless of the size of the population. A census: what fraction of the population you sample doesn"t matter, population we"re studying may change, difficult to complete a census, hard to locate or hard to measure, census can be a cumbersome multiple addresses or none. Statistic: any summary found form the data estimate. Statistic/ estimate: mean household income of the 1000 households. Simple random sample: combination of individuals has an equal chance of being selected. Stratified sampling: slice the population into homogeneous groups and then use simple random sampling within each stratum, coming the results.
