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ryan84
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#1
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Whats the difference between sigma and mu?
And how do you know which one to use?

Cheers
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jameswhughes
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\mu= mean
\Sigma= sum of a set of numbers

Is this what you meant?
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Cesca
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Sigma is used to show the standard deviation (or varience, which is s.d. squared), and mu is used to show the mean.

I hope thats what you wanted to know. Im doing the exam soon and i get most of it mixed up.
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ryan84
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Ahh ok.

However there are two types of mean right? Bar x and mu, I get that bar x= sample mean and mu= population mean. But how exactly do you know which one to use in the question?

like e.g. if you have a list of numbers: 2,3,5,6 and were asked to work out the mean is it bar x or mu?

Thanks!
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ryan84
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Eloades11
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(Original post by ryan84)
Ahh ok.

However there are two types of mean right? Bar x and mu, I get that bar x= sample mean and mu= population mean. But how exactly do you know which one to use in the question?

like e.g. if you have a list of numbers: 2,3,5,6 and were asked to work out the mean is it bar x or mu?

Thanks!
If you are on OCR, then you shouldn't worry too much about x bar and mu until S2(central limit theorm/sampling). In your example I would just use what the question uses. Unless they just say work out the mean, then just say the mean = ...
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ryan84
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ok, but im on aqa and im pretty sure clt is on s1
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Eloades11
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(Original post by ryan84)
ok, but im on aqa and im pretty sure clt is on s1
Ok, I mentioned clt, but I don't think it comes up in that. Just sampling.

For example, if we take a sample of a population, and we know the mean of the population, that is donated by mu, and the sample mean is donated by x bar. Although we only work out sample means to try and estimate the population mean! I'll check your specification for you, 2 minutes
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Eloades11
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http://store.aqa.org.uk/qual/pdf/AQA-6380-W-SP-11.PDF
Is this the correct spec? AQA have A-level maths and A-level statistics, I assumed you're doing A-level statistics.

On this spec clt and sampling both come up
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