SOAN 2120 Study Guide - Final Guide: Simple Random Sample, Central Limit Theorem, Sampling Frame
3 Mar 2013
School
Department
Course
Professor
Document Summary
Qualitative research uses nonrandom samples or nonprobability samples: this means they rarely determine the sample size in advance and have limited knowledge about the larger group from which the sample is taken. Haphazard: get any cases in the manner that is convenient, cons: can produce ineffective, unrepresentative samples, eg: television interviewers on the street they conveniently go to whoever is around and interview them. Purposive: get all possible cases that fit particular criteria using various methods, expert uses judgment in selecting cases with a specific purpose in mind, appropriate in three situations. Select members of a difficult to reach population. When research wants to identify certain types of cases for in- Snowball depth investigation: get cases using referrals from one or a few cases, and then referrals from those cases, and so forth, method for identifying and sampling the cases in a network, it essentially snowballs .
