SAMPLING PRODECURE (NON-PROBABILITY)

• NON-PROBABILITY SAMPLING

  • there is a form of bias in the selection of the sample
  • no assurance that each element in the population has the same equal chance of being selected as a sample
  • no assurance that each unit in the population is properly represented
  • findings are limited to the sample
• CONVENIENCE SAMPLING

  • based in the convenience of the research
  • sometimes called ACCIDENTAL SAMPLING
  • is practical when some data is netter than no data
  • is not practical when any data used in your research needs to be definitive, representative, & unbiased
• CONSECUTIVE SAMPLING

  • it seeks to include all accessible subjects as part of the sample
  • best type of non-probability sampling
  • selects as sample/group of people and conducts research over a period before moving on to the next sample/group
• SNOWBALL SAMPLING

  • works the same way as referral system
  • initial sample members are asked to refer other people who meet the criteria required by the researcher
• QUOTA SAMPLING

  • identifies population sections or strata and DECIDES HOW MANY PARTICIPANTS are required from each section
• PURPOSIVE SAMPLING

  • used when participants are grouped according to a set of criteria specified in research