Sampling

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Sampling

  1. 1. GROUP-C2<br />Ashwini Kumar (FK-2010)<br />Anoop B (FK-2005)<br />Garimella V K Aditya (FK-2006)<br />Abinash Nanda (FK-2010)<br />PrabhjotKaur Gill (FK-2012)<br />Sajit G Nair (FK-2013)<br />
  2. 2. SAMPLING<br />Sampling is that part of statistical practice concerned with the selection of an unbiased or random subset of individual observations within a population of individuals intended to yield some knowledge about the population of concern, especially for the purposes of making predictions based on statistical inference.<br />TYPES:<br /> 1)Non-probabilistic sampling<br /> 2)Probabilistic sampling<br />
  3. 3.
  4. 4. Concepts of sampling<br /><ul><li>Universe/population
  5. 5. Sampling design
  6. 6. Sampling frame
  7. 7. Sampling error
  8. 8. Sampling distribution</li></li></ul><li>Factors to be considered while selecting sample size<br /><ul><li>Nature of universe
  9. 9. Number of classes proposed
  10. 10. Nature of study
  11. 11. Type of sampling
  12. 12. Standard of accuracy and accepted confidence </li></ul> level<br /><ul><li>Availability of finance
  13. 13. Other considerations</li></li></ul><li>TYPES OF SAMPLING….<br /><ul><li>SIMPLE RANDOM SAMPLING : Every item has an equal chance of inclusion in the sample and has the same probability of being selected. The methods are:</li></ul> 1)Lottery System<br /> 2)Random Table Method.<br /> Ex :Introduction of new software in a company.<br /> 3)Computer.<br />
  14. 14. SYSTEMATIC SAMPLING..<br /><ul><li>In Systematic sampling , sampling is done by selecting elements in an ordered way.</li></ul> For ex:<br /> 1)Selecting 15th name of a list.<br /> 2)In Supermarket selecting a customer.<br />
  15. 15. DELIBRATE SAMPLING..<br /><ul><li>It involves purposive or deliberate selection of particular unit of universe for constituting a sample which represents universe.</li></ul> > Convenience Sampling.<br /> for ex: researchers collecting data from gasoline buyers.<br /> > Judgment Sampling<br /> for ex: 1)A judgment of sample of college students.<br /> 2)Whistle Blowing Program(WBP). <br />
  16. 16. STRATIFIED SAMPLING..<br /><ul><li>Stratification is a process of grouping members of the population into relatively homogenous subgroups before sampling.
  17. 17. The population is stratified into no. of non overlapping subpopulations or strata and then sample items are selected from them.</li></li></ul><li>Non Probabilistic Sampling<br />Convenience Sampling<br />Snowball Sampling<br />Quota Sampling<br />

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