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    Samples studied when we want to know about populations

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    Can you tell me why are samples studied when we want to know about populations? Why are random samples used instead of just any sample? How would you determine an appropriate sample size? If there are any reference please provide.

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    A population in statistics is considered infinitely large, so large that it cannot all be measured. Therefore the only way an inference or judgement can be made about the population is by studying ...

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    Can you tell me why are samples studied when we want to know about populations? Why are random samples used instead of just any sample? How would you determine an appropriate sample size? If there are any reference please provide.

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