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Math project help

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1080ski
Posts: 4424 - Karma: 191
i have to do a math project. this is the "story" for it. somebody wrote a threat, and 3 people confessed to writing the letter, but only one did it. theres 25 documents from each kid, and they took the percentage ofof "and/by/the" in the paper, and the percentage of words writen off the line. i put all thsoe numbers into a list on my calculater (ti 86) and i have to show 2 ways who the person who wrote it is. i can use averages, standard deviation, and that stuff. how can i use standard deviation to prove who did it? i dont really understand what it is so an explanation of that might help.
Jan 2 2006 4:15PM
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eheath
Posts: 61603 - Karma: 123,093
I love kids that come on NS asking about hw, and it just turns out they are stupid and didnt ask there teacher one question or just didn't listin.
Jan 2 2006 4:16PM
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1080ski
Posts: 4424 - Karma: 191
thanks for the help
Jan 2 2006 4:17PM
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freezed
Posts: 12973 - Karma: 500
standard deviation...umm. well, in a list of data, 65% of the data is within one standard deviation, and 95% (maybe 98, i forgot) of the data is within two standard deviations.

i took stats a while ago. i dunno.
Jan 2 2006 4:17PM
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eLevate
Posts: 2489 - Karma: 49
probably the average thats the closest to the threat letter analysis number.
Jan 2 2006 4:18PM
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1080ski
Posts: 4424 - Karma: 191
i know that one but i have to show it in 2 ways
Jan 2 2006 4:24PM
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eLevate
Posts: 2489 - Karma: 49
or the one thats within one standard deviation of the mean?
Jan 2 2006 4:28PM
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1080ski
Posts: 4424 - Karma: 191
no i can take the average and/or the standard deviation. what other way besides standard deviation could i prove which person it is?
Jan 2 2006 4:40PM
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eLevate
Posts: 2489 - Karma: 49
take both. take the closest average, and the one closest in stand. dev. from the mean. they should be the same if i recall correctly
Jan 2 2006 5:01PM
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