# Random sampling methods in research

Simple random sampling is a method used to cull a smaller sample size from a larger population and use it to research and make generalizations about the larger group.Say you have a list of 10,000 people and you want a sample of 1,000.

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Probability Sampling Techniques Probability sampling is a technique wherein the samples are gathered in a process that gives all the individuals in the population equal chance of being selected.In a systematic sample, the elements of the population are put into a list and then every n th element in the list is chosen systematically for inclusion in the sample.The following explanations add some clarification about when to use which method.Many dissertation supervisors advice the choice of random sampling methods due to the representativeness of sample group and less room for researcher bias compared to non-random sampling techniques.

So you get a list of all the physicians that work in the hospital, write their names on a piece of paper, put those pieces of paper in the box, shake and draw.For the latter reason, convenience samples are commonly used in the early or pilot stages of research, before a larger research project is launched.It is designed to organize the population into homogenous subsets before sampling, then drawing a random sample within each subset.

This yields a sample that is proportionately representative of the firm as a whole.Correlation Analysis Mean, Mode and Median Regression Analysis.

There are four categories of probability samples described below.To gather such a sample, you would likely use some form of non-probability sampling.Cluster sampling really works best when there are a reasonable number of clusters relative to the entire population.With Example 2: Either stratified sampling or cluster sampling could be used.

### Chapter 8: Quantitative Sampling

Comparing Random with Non-Random Sampling Methods. by. The RAND Corporation is a research organization that develops.

In 5 of those surveys, the confidence interval would not contain the population percent.Usually, however, the population elements are already grouped into subpopulations and lists of those subpopulations already exist or can be created.Stratification may improve the estimates of characteristics of the whole population.Availability sampling is a method of choosing subjects who are available or easy to find.Each element is marked with a specific number (suppose from 1 to N ).Many consider this to be the more methodologically rigorous approach to sampling because it eliminates social biases that could shape the research sample.

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The researcher could, however, create a list of churches in the United States, choose a sample of churches, and then obtain lists of members from those churches.You shake the box, draw a piece of paper and set it aside, shake again, draw another, set it aside, etc. until we had 100 slips of paper.

Social research is often conducted in situations where a researcher cannot select the kinds of probability samples used in large-scale social surveys.This process continues until the researcher has all the interviews she needs, or until all contacts have been exhausted.Given the large sample frame is available, the ease of forming the sample group i.e. selecting samples is one of the main advantages of simple random sampling.Though this method can be useful, the researcher will not be able to use the results from a convenience sample to generalize to a wider population.It is a research technique widely used in the social sciences as a way to gather information about a population without having to measure the entire population.Quantitative Research Methods ENGL 5377. using correct sampling methods allows researchers the ability.More specifically, each sample from the population of interest has a known probability of selection under a given sampling scheme.

### Purposive Sampling as a Tool for Informant Selection

Application of simple random sampling method involves the following stages.Research Methods. respondents are selected by other methods like purposive sampling or random sampling.This would ensure that the researcher has adequate amounts of subjects from each class in the final sample.

### Comparing Random with Non-Random Sampling Methods

To collect a simple random sample, each unit of the target population is assigned a number.A quota sample is one in which units are selected into a sample on the basis of pre-specified characteristics so that the total sample has the same distribution of characteristics assumed to exist in the population being studied.There is also a statistical advantage in the method, as a stratified random sample.A stratified purposeful sampling approach can lend credibility to a research.The lottery method of creating a simple random sample is exactly what it sounds.With stratified sampling one should: partition the population into groups (strata) obtain a simple random sample from each group (stratum) collect data on each sampling unit that was randomly sampled from each group (stratum).

Relying on available subjects, such as stopping people on a street corner as they pass by, is one method of sampling, although it is extremely risky and comes with many cautions.Then, you generate a list of 50 random numbers--typically with a computer program--and the individuals assigned those numbers are the ones you include in the sample.

It can be difficult to determine how a sample compares to a larger population.It is important to note that application of random sampling method requires a list of all potential respondents (sampling frame) to be available beforehand and this can be costly and time-consuming for large studies.Probability sampling. of probability samples: random and. into characteristics of importance for the research.

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Selecting Research Area Aims and Objectives Rationale for the Study Research Structure Literature search strategy Literature review sources Referencing Dealing with Supervisor.

With Example 3: Cluster sampling would probably be better than stratified sampling if each individual elementary school appropriately represents the entire population as in aschool district where students from throughout the district can attend any school.This is technically called a systematic sample with a random start.When and How to Use Snowball Sampling in Sociological Research.This method gives every member of the target group an equal chance of being.Quota sampling is designed to overcome the most obvious flaw of availability sampling.Simple random sampling is a method of selecting n units from a population of size N such that every possible sample of size an has equal chance of being drawn.