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What kind of validity does the strategy of random sampling increase?

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2010-04-19 03:55:02
2010-04-19 03:55:02

Random Sampling increases the reliability and validity of your research findings.

To begin with,

Reliability:

By randomly picking research participants, the likelihood that they are from different backgrounds/ have different experiences etc. is higher and hence, they are said to be more representative of the population of interest.

EG: RQ: Do females have higher IQ?

A case of random sampling will pick females who are housewives/ CEOs/ Indian/ 18yrs old/ Divorced etc. the list goes on.

While a case of non-random sampling (such as picking participants at a bus stop) may only result in a sample of females who are 20 - 35 years old, working professionals.

Validity: As reliability and validity are related, for the research findings to be reliable and generalizable to the population of interest, it first has to be a valid sample.

Hence, from the above example,

EG1 provides a valid sample, while EG2 is invalid.

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You are correct; convenience sampling is not random sampling.

It can be but it is not simple random sampling.

Simple Random Sample Stratified Random Sampling Cluster Sampling Systematic Sampling Convenience Sampling

Random Sampling

Simple random sampling, stratified random sampling and cluster sampling are all based on a degree of randomness; other methods less so.

They include: Simple random sampling, Systematic sampling, Stratified sampling, Quota sampling, and Cluster sampling.

Random sampling is picking a subject at random. Systematic sampling is using a pattern to pick subjects, I.e. picking every third person.

"A random sampling indicates that no persons have actually seen pigs fly.

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stratified sampling, in which the population is divided into classes, and random samples are taken from each class;cluster sampling, in which a unit of the sample is a group such as a household; andsystematic sampling, which refers to samples chosen by any system other than random selection.

Random Sampling is the most common sampling technique

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When would random sampling not be the best approach to sample selection

Sampling techniques in researching involves to types of sampling. The probability sampling and the non-probability sampling. Simple random is an example of probability sampling.

simple random, stratified sampling, cluster sampling

sampling is very important for researcher

Non probability sampling and probability sampling are different because probability sampling uses random samples. Non probability sampling aren't random, but can still be representative of the population as a whole if done correctly.

stratified random sampling is a sample(strata) that a same and hemogenieous in group and that a different and heterogenious in group

They think that if they used the random sampling after people voted because they want to get a better view of who will be the next president.

Sampling error leads to random error. Sampling bias leads to systematic error.

Random sampling can be defined as the selection of a random sample; each element of the population had an equal chance of been selected. Random sampling is used in psychology, statistics, math, sociology, movement and research.


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