# what do these standard deviation error bars show

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#1
What do these standard deviation error bars show in the image I attached, I don't really understand them
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#2
any clue?
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3 years ago
#3
(Original post by tammie123)
any clue?
Standard deviation is variation about a mean. The bigger the error bars, the larger the variation is around the mean.

Generally, in the context of biology questions like this, it's asking you to say something about the significance of the results. If the error bars overlap, do you think this implies the results are significant or not? As in, do you think the sets of data are significantly different from each other?
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#4
(Original post by Amefish)
Standard deviation is variation about a mean. The bigger the error bars, the larger the variation is around the mean.

Generally, in the context of biology questions like this, it's asking you to say something about the significance of the results. If the error bars overlap, do you think this implies the results are significant or not? As in, do you think the sets of data are significantly different from each other?
so say the x axis was 'different diagnoses' and each bar represented a specific disease and the y axis was mean serotonin levels then the larger the error bars then the greater the standard deviation about the mean of the bar the error bars attached to i.e. for that specific disease. Is this correct?
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3 years ago
#5
(Original post by tammie123)
so say the x axis was 'different diagnoses' and each bar represented a specific disease and the y axis was mean serotonin levels then the larger the error bars then the greater the standard deviation about the mean of the bar the error bars attached to i.e. for that specific disease. Is this correct?
Yep, that's right
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#6
(Original post by Amefish)
Yep, that's right
How can you tell if standard deviation error bars are big or not?
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3 years ago
#7
(Original post by tammie123)
How can you tell if standard deviation error bars are big or not?
Statistically speaking, all 3 bars don't mean anything in terms of significance/big/small - you gotta do statistical analysis and find the p value (try minitab).

Although, it depends on what level your comment needs to be. At A level you could get away with 'not significant since error bars overlap' but at uni you have to justify via statistical analysis ie p value is > 0.05 therefore not significant.
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