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because it is simpler and more accurate

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Q: Why is a sample used more often than a population?
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Why is a sample better than a census?

its better because we often don't have to survey a large population, so a sample is quicker, easier, requires few ressources, little time and can be more accurate if a person is not there to answer it because a sample could represent that person.


If the size of a sample equals to the size of the population?

Sample is subset of the population so sample size and population size is different.However, as a subset can be the whole set, if the sample size equals the population size, you have sampled the entire population and you will be 100% accurate with your results; it may cost much more than surveying a [representative] sample, but you get the satisfaction of knowing for what you surveyed the population exactly.Using a sample is a trade off between the cost of surveying the whole population and accuracy of the result.A census is a survey of the whole population and could be considered that the sample size = population size; in this case the results are 100% accurate.The television viewing figures are calculated using a sample of the whole population and then extrapolating them to the whole population; depending upon how the same was chosen, including its size, will affect the accuracy of the results - most likely not more than 95% accurate.With a carefully selected (that is properly biased) sample you can prove almost anything!


When can you estimate a population's size when counting individuals in a sample of the population?

You can estimate a population's size when counting individuals if the density in a sample is greater than the population density.


How the sample survey is better than population survey?

It's not.


In statistics if a condition occurs to more than 10 percent of the population is this considered abnormal?

I am under the assumption that in statistics, if the ten percent condition is not met, meaning that the sample size is more than 10% of the population, then the result is not a normal distribution.