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September 29th, 2014, 12:54 AM  #1 
Newbie Joined: Dec 2010 Posts: 6 Thanks: 0  A laymans description of Standard Deviation
Hi, I am writing a report for the layman where I am looking at changes in various metrics. What I want to explain is that some changes are inline with normal fluctuations and so the overall upwards or downwards change isnt really noteworthy. I was using the term 'inline with expectations' however the underlying trend might not atually be what was expected and I want to be cautious. What I would like to explain is that the change is within 1 standard deviation but without using the term 'standard deviation' as I think this might switch those not familiar with statistics off. Any ideas how I could describe this anyone? Many thanks, Taylrl 
September 29th, 2014, 12:11 PM  #2 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,683 Thanks: 2664 Math Focus: Mainly analysis and algebra 
'within normal variation' 'within normal bounds' 
September 29th, 2014, 12:39 PM  #3 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms 
We expect that the result will fall in the range X..Y, and these results are within expected bounds (or tolerance, etc.).


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