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# Maths sampling question watch

1. Hi guys, I am confused what to write for this question... Pls someone help me with this:

explain why a sampling approach is used and define what constitutes an unbiased sample.

2. (Original post by Katieha)
Hi guys, I am confused what to write for this question... Pls someone help me with this:

explain why a sampling approach is used and define what constitutes an unbiased sample.

Well it depends. Is is random, systematic, stratified, convenience, judgement based, using quotas, using snowballs.... all have different uses.

Unbiased - 'An unbiased (representative) sample is a set of objects chosen from a complete sample using a selection process that does not depend on the properties of the objects' - Wikipedia. The real questions [email protected]
is an unbiased sample a good thing? - depends may be too difficult/time consuming to collect
can you correct for bias? - yes in some situations.
3. (Original post by tombayes)
Well it depends. Is is random, systematic, stratified, convenience, judgement based, using quotas, using snowballs.... all have different uses.

Unbiased - 'An unbiased (representative) sample is a set of objects chosen from a complete sample using a selection process that does not depend on the properties of the objects' - Wikipedia. The real questions [email protected]
is an unbiased sample a good thing? - depends may be too difficult/time consuming to collect
can you correct for bias? - yes in some situations.
Thank you

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4. (Original post by Katieha)
Thank you

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no problem

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Updated: January 14, 2015
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