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# i need help watch

1. hi im stuck on as i have to work out the standard diviation for my biology coursework.
i know the formula but when i look at given examples they only have 1 line of data.
eg
5
6
7
8
9
3
2

however i have four lines of data as i have 4 conditions. each line has 48 numbers in it though. can any 1 help me apply the data to satandard diviation. or will i have to do 4 standard diviations for each line.
2. (Original post by horrorboy)
hi im stuck on as i have to work out the standard diviation for my biology coursework.
i know the formula but when i look at given examples they only have 1 line of data.
eg
5
6
7
8
9
3
2

however i have four lines of data as i have 4 conditions. each line has 48 numbers in it though. can any 1 help me apply the data to satandard diviation. or will i have to do 4 standard diviations for each line.
Is the data fin each line from a different test or are they just from re-runs of the same test/experiment (under the same conditions etc etc). If the conditions weren't identical then you need to work out 4 SDs if the conditions were identical then you can combine the 4 datasets into a single dataset and do a single SD.
3. (Original post by Pencil Queen)
Is the data fin each line from a different test or are they just from re-runs of the same test/experiment (under the same conditions etc etc). If the conditions weren't identical then you need to work out 4 SDs if the conditions were identical then you can combine the 4 datasets into a single dataset and do a single SD.
thanks er the 4 sets of data are from four different conditions. r u sure i need to do 4 sd's. also i have to do a t test wud i need to do 4 of these?
soz i know my knowledge is severely lacking lol
cheers

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