Well I am not sure about this but this is what i understood about the post.
The criteria for selecting a sampling design are as follows:
- GOAL ORIENTATION: While selecting a sampling design, a
researcher will keep in mind the final goal or say the objective of the study. The sample choosen should be such that the objective of the research is fulfilled. For e.g. a researcher may or may not want to generalize the results among the whole population, but only to the school from where the sample is. - MEASUREABILITY: The sample design should be such that the results of the study are measurable. The sample size should be such that the results couls be generalized to the whole population.
- PRACTICALITY: The sampling design choosen for the research should be done keeping in mind the practicality of the design. the resaercher needs to practically think of all the possible problems that could be faced.
Also theresearcher needs to keep in mind the accessibility of the samples practically. (keeping in mind the problems we discussed yesterday). - ECONOMY: One of the most important criteria that should
be kept in mind is economy, that is the money factor, as the funds required for the research will be more or less, depending on the sample design. And the sample design will in turn depend on the funds available for research. Also, the researcher may not be able to conduct the research & hence might need research assistants for help. The time factor should also be kept in mind. The activities in any research should be well planned & the researcher keeping in mind the time available for research should choose a sample design.
Image 1: http://secwepemc.org/2step/goals.gif
Image 2: http://www.jamesheiresconsulting.com/Tape%20Measure.jpg
Image 3: http://www.usask.ca/uofs/report98/images/accessibility.jpg
Image4: http://library.thinkquest.org/J003358F/money_tree5.jpg
