A representative sample is a subset of a population that seeks to accurately reflect the characteristics of the larger group . ... Samples are useful in statistical analysis when population sizes are large because they contain smaller, manageable versions of the larger group.
What is a representative sample and why is it important?
A representative sample allows researchers to abstract the collected information to a larger population . Most market research and psychological studies are unsuitable in terms of time, money, and resources to collect data on everyone.
How do you know if a sample is representative?
A representative sample should be an unbiased reflection of what the population is like . There are many ways to evaluate representativeness—gender, age, socioeconomic status, profession, education, chronic illness, even personality or pet ownership.
How do you obtain a representative sample?
In order to obtain a representative sample, they need to look at what percentage of U.S. citizens share certain qualities such as ethnic background and gender and ensure that their sample accurately reflects those numbers.
What is representative sample quizlet?
Representative sample. A sample having essentially the same characteristics as the population . Haphazard selection or a random-based selection method can be expected to produce a sample that is representative of the population. Route.
What is another name for representative sample?
| cross section sampling | sample selection | slice sampler | example range | representation transection |
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What is the difference between a sample and a representative sample?
Representative sampling and random sampling are two techniques used to help ensure data is free of bias. A representative sample is a group or set chosen from a larger statistical population according to specified characteristics. A random sample is a group or set chosen in a random manner from a larger population.
What percentage of sample is representative?
For example, in a population of 1,000 that is made up of 600 men and 400 women used in an analysis of buying trends by gender, a representative sample can consist of a mere five members, three men and two women, or 0.5 percent of the population .
Can a small sample be representative?
Sample Size vs. Representative Samples. ... Large unrepresentative samples can perform as badly as small unrepresentative samples . A survey sample's ability to represent a population is much more closely related to the sampling frame (the list from which the sample is selected) than it is to the sample size.
What is a good representative sample size?
A good maximum sample size is usually around 10% of the population , as long as this does not exceed 1000. For example, in a population of 5000, 10% would be 500. In a population of 200,000, 10% would be 20,000. This exceeds 1000, so in this case the maximum would be 1000.
What is an example of a random sample?
An example of a simple random sample would be the names of 25 employees being chosen out of a hat from a company of 250 employees . In this case, the population is all 250 employees, and the sample is random because each employee has an equal chance of being chosen.
Is the method of getting sample?
- Simple random sampling. ...
- Systematic sampling. ...
- Stratified sampling. ...
- Clustered sampling. ...
- Convenience sampling. ...
- Quota sampling. ...
- Judgement (or Purposive) Sampling. ...
- Snowball sampling.
What is a sample Psychology example?
Instead, what they do is test a smaller group of college students , known as a sample. In this example, everyone who could possibly be a participant in the study (meaning, all college students) is part of the population. Thus, a sample is a relatively small number of participants drawn from an entire population.
Which of the following is a good example of representative sample?
A representative sample is a subset of a population that seeks to accurately reflect the characteristics of the larger group. For example, a classroom of 30 students with 15 males and 15 females could generate a representative sample that might include six students: three males and three females.
What produces an unrepresentative sample?
An unrepresentative sample is one that does not reflect the distribution of characteristics of the target group , cannot be generalised to the target population, and is therefore biased. There are a number of different sampling methods.
What is the benefit of having a representative sample quizlet?
A representative sample should be used which has all the same characteristics as the population . This allows for conclusions that are based on them to be legitimately generalized to the populations from which they are drawn. Accurately reflects the distribution of relevant variables in the target population.
