HELP! Stats Problemo.... - HotUKDeals
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HELP! Stats Problemo....

SkippyDoo Avatar
8y, 8m agoPosted 8 years, 8 months ago
Hey there people

Helping my nephew with a question he was set....He is given no data just the average and the questions asks him work out the standard deviation from that.

How is that possible as I remember you needed all the data from where youy worked out the average and then work out standard deviation!?

Any Idea...
SkippyDoo Avatar
8y, 8m agoPosted 8 years, 8 months ago
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Comments/page:
#1
do you have the numbers that make up that average or the sample size?
#2
You can't work out standard deviation from just the average. SD is a measure of how far the items deviate from the average, so using the average alone as a measurement can never give anything but 0 - one number can't deviate from itself.
#3
Hi there

I square rooted the average given and got the answer :thumbsup:

Wooooo

Thanks for you replies anyway!
#4
the question they gave you must have been wrong, should have said variance rather than average
#5
SkippyDoo;1721012
Hi there

I square rooted the average given and got the answer :thumbsup:

Wooooo

Thanks for you replies anyway!

you can't square root an average.
What you had was an average of the sum of each of the deviations squared.

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