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This is a very broad question. I have included a link from the internet, but you can find many other links by searching under sampling methods.
Usually the question is:
What makes a sample's statistics be an accurate representation of the population?
No sample is a perfect representation of the population, but some samples are more representative than others.
If you are conducting a survey, you should make sure that the results are unbiased. For example, if you are asking people if they like to excersize, you should not do this at your local health club and then claim your sample represents everyone in your community.
Your sample should contain enough data. Sometimes, important surveys require hundreds or thousands of interviews. Asking a few people questions is not a good way to collect a sample.
There should be a plan to your collection of data, that is well documented. Sometimes, it is necessary to have a professional outside group conduct the study, so a representative sample is gathered. The Gallup organization are very well known for conducting political surveys. You don't want someone to "pick and choose" his data to get a certain result.
These are just some ideas- you may find more in the related link.
What else can I help you with?
Why does a statistical sample have to be large?
The larger the sample of data collected leads to a more accurate conclusion.
How does sample size effect the test statistic?
The larger the sample size, the more accurate the test results.
What happens when you increase the sample size in an experiment?
Estimates based on the sample should become more accurate.
How fresh should a cat stool sample be for accurate testing and analysis?
A cat stool sample should be fresh, ideally within 12 hours, for accurate testing and analysis.
How fresh does a cat stool sample need to be for accurate testing and analysis?
A cat stool sample should be fresh, ideally collected within 24 hours, for accurate testing and analysis.
How is that the random sample gives a fairly accurate representation of public opinion?
The larger the sample, the greater the accuracy, but in every case, the sample must be truly random.
What is the identity of SAMPLE 10?
I'm sorry, but I need more context about SAMPLE 10 to provide an accurate answer. Could you please specify what SAMPLE 10 refers to?
Why is sample survey better than a census?
becuase it is more accurate.
How do you use a balance to obtain an accurate mass?
By comparing the sample with a known mass
How is it that a random sample gives a fairly accurate representation of public opinion?
It's obviously not completely accurate. But the more people you include the more accurate it gets. Statisticians choose the sample size to be large enough for a fairly accurate representation.
Why is a sample often used instead of a census?
because its faster and then when you use a sample you can easily make accurate predictions about what would/will happen next
Why was it important for mendel to study such a large sample of pea plant?
(Apex Learning) A higher sample size gives more accurate results.
