whats the differece between s and σ ?? Watch

hotfreezer
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#1
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#1
According to this revision guide s and σ aren't the same thing and you caulculate them differently, but we've never been told ANYTHING about that.... :confused: got S1 tomorrow.... *panick* can someone please help me???
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Chewwy
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#2
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according to my friend greek letters are for populations, latin letters are for samples. personally, i don't have a clue.
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TheDuck
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chewwy is right...basically for something of a sample you divide my n-1 but for a population you divide b n. It might be the mean/variance for which you do this...but I cant remember. But chewwy is definitely right.
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hotfreezer
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Thanks guys! do you know if we need to know this for Edexcel S1?
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July_Dragon
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I'm also doind Edexcel S1 tomorrow and I've been taught that so would assume we do need to know it , my teacher said that if you forget to put it in a question involving a sample, you'll only lose a mark or two though. (and yes it is for the mean/variance)
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hotfreezer
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(Original post by July_Dragon)
I'm also doind Edexcel S1 tomorrow and I've been taught that so would assume we do need to know it , my teacher said that if you forget to put it in a question involving a sample, you'll only lose a mark or two though. (and yes it is for the mean/variance)
Are you sure? :confused: its not on our syllabus and different people have been telling me different things.
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rugbygraham
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in the jan 2005 paper, on the standard deviation question (I think q5) it quite clearly states it is a SAMPLE but then the markscheme uses the equation for a POPULATION with no mention of the sample formula. I can only assume its been removed from the syllabus.
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