Training Educators to Design and Develop ODL Materials/Needs Analysis/RANDOM SAMPLING

In random sampling, all items have some chance of selection that can be calculated. Random sampling technique ensures that bias (see: page 179) is not introduced regarding who is included in the survey. Five common random sampling techniques are:


 * simple random sampling,
 * systematic sampling,
 * stratified sampling,
 * cluster sampling, and
 * multi-stage sampling.