sampling

Slide 1: 

SAMPLING Multi Media Learning Centre Presentation Slide # 1

UNIVERSE AND POPULATION : 

UNIVERSE AND POPULATION Refers to the total of items about which information is required for a particular study Universe Refers to the total of all items in a field of inquiry Population Slide # 2

EXAMPLES : 

EXAMPLES Teachers working at Schools in South Africa Teachers working at Government Schools in South Africa Universe Population Slide # 3

POPULATION : 

POPULATION A group of individuals that have one or more characteristics in common that are of interest to the evaluator / researcher Slide # 4

SAMPLE : 

SAMPLE A small proportion of a population selected for Observation and Analysis Slide # 5

SAMPLING : 

SAMPLING The Sample should be representative of the population. Slide # 6

Slide 7: 

SAMPLE SIZE OF THE SAMPLE METHODS OF SELECTING SAMPLE Slide # 7

Slide 8: 

METHODS OF SAMPLING Probability Sampling Non-Probability Sampling Every individual has an equal chance of being chosen for study In this method the Researcher uses whatever Subjects are available or considered significant Example: Random Sampling Systematic Sampling Example: Purposive Sampling Convenience Sampling Slide # 8

METHODS OF SAMPLING : 

E.g.: All Students of a particular Class in a College METHODS OF SAMPLING Probability Sampling Simple random sampling Systematic sampling Stratified sampling Cluster sampling Selecting at random Selecting every nth case Sampling within groups of the population Surveying whole clusters of the population sampled at random Slide # 9

NON–PROBABILITY SAMPLING METHODS : 

NON–PROBABILITY SAMPLING METHODS Convenience sampling within groups of the population Convenience sampling Voluntary Sampling Quota Sampling Sampling those most convenient The sample is self – selected Slide # 10

NON–PROBABILITY SAMPLING METHODS : 

NON–PROBABILITY SAMPLING METHODS Building up a sample through informants Purposive sampling Snowball Sampling Hand – picking supposedly typical or interesting cases Slide # 11

OTHER KINDS OF SAMPLING : 

OTHER KINDS OF SAMPLING Event sampling Time Sampling Using routine or special events Recognizing that different parts of the day, week or year may be significant Slide # 12

Slide 13: 

Slide # 13 hansrajhr@ukzn.ac.za Thank You