sampling.docx

# Predict the proportion of the study compute the

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confidence level to a Z-score by using a Z-score table. Predict the proportion of the study. Compute the needed sample size by plugging your values into the following formula, where Z is the Z-score, P is the proportion and I is the confidence interval. Non-probability sampling Non-probability sampling is a sampling technique where the samples are gathered in a process that does not give all the individuals in the population equal chances of being selected. There are various types of non-probability sampling including Convenience Sampling, Consecutive Sampling, Quota Sampling, Judgmental Sampling, and Snowball Sampling. This method is mainly used when: This type of sampling can be used when demonstrating that a particular trait exists in the population. It can also be used when the researcher aims to do a qualitative , pilot or exploratory study. It can be used when randomization is impossible like when the population is almost limitless.

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SAMPLING METHODS 3 It can be used when the research does not aim to generate results that will be used to create generalizations pertaining to the entire population. It is also useful when the researcher has limited budget, time and workforce. This technique can also be used in an initial study which will be carried out again using a randomized, probability sampling.
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• Fall '14
• Dr. Bernard Mutuku Nzimbi
• Economics, researcher, Systematic Sampling

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