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Why might researchers study just a sample of a large population rather than the whole population?
Wiki User
∙ 12y ago
Because the whole population might be too large to sample.
A good example is the population of the world. At nearly 7 billion people, it would be unrealistic to sample each person to determine some factor that you are looking at. Generally, we sample a subset of the population, taking into account differences (or errors) that might result, in this case, regional and cultural, in order to estimate the behavior of the larger population.
Wiki User
∙ 12y ago
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A sample average can be used to estimate a population average precision if the sample is?
large
Explain the differences between a sample and a population?
A sample consists of a small portion of data when a population is taken from a large amount.
What two features must a sample have if its to accurately represent a population?
The sample must be large and random.
What is he conclusion from research conducted on a sample population to the population as a whole?
Assuming that the population was carefully defined, the sample population was carefully and correctly chosen, and that there were significant results, then the implication is that the results of the study, within the confidence limits indicated, hold true for the population at large.
What are the disadvantages for random sampling?
its time consuming and expensive if its a large sample you need or a big target population
When researchers survey part of a large group what is the name of the group that they survey?
A sample! And the large group is called the population.
A sample average can be used to estimate a population average precision if the sample is?
large
Explain the differences between a sample and a population?
A sample consists of a small portion of data when a population is taken from a large amount.
What two features must a sample have if its to accurately represent a population?
The sample must be large and random.
When every individual in a large population has a small but equal chance of being included in a survey researchers are using a procedure known as?
Researchers are using a procedure known as simple random sampling. This involves selecting individuals at random, where every individual has an equal chance of being selected, to ensure the sample is representative of the population.
What does it means if the standard deviation is large?
that you have a large variance in the population and/or your sample size is too small
What is the term for a small group that accurately reflects a large population?
The term is "representative sample." It is a subset of a population that accurately reflects the characteristics of the whole population it is meant to represent.
How large should the sample be to be large enough?
Span the full spectrum of a population's genetic variation. <apex> Reflects the genetic variation of a population...
What are the advantages and disadvantages of large samples?
A large trial is necessary to provide good sample that is representative of the population
The law of large numbers?
The law of large numbers states that as the number of observations in a sample increases, the sample mean will tend to approach the population mean. In other words, the larger the sample size, the more accurate the estimate of the population parameter. This law forms the basis for statistical inference and hypothesis testing.
When the sample size is large valid confidence intervals can be established for the population mean irrespective of the shape of the underlying distribution?
Yes, but that begs the question: how large should the sample size be?
A ________ is a way to measure public opinion by interviewing ________ population?
mass survey; a large sample of the
