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Poll: round 2.0469 to two significant figures
  2.0
  2.1


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Author round 2.0469 to two significant figures
myke
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17th Nov 05 at 14:38   View User's Profile U2U Member Reply With Quote

what i believe to be conventional rounding has just been rubbished by my boss, so i'm curious
dna23
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17th Nov 05 at 14:39   View User's Profile U2U Member Reply With Quote

2.04 imo
Lawrah
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17th Nov 05 at 14:39   View Garage View User's Profile U2U Member Reply With Quote

2.0

i think..
stuartmitchell
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17th Nov 05 at 14:39   View User's Profile U2U Member Reply With Quote

I thought rounding occured after the deciaml place so in this instance it would be 2.05

This is becasue the 4th number ie 6 is >5 therefore you round the 3rd number ie 4 up to 5 hence

2.05

[Edited on 17-11-2005 by stuartmitchell]
gianluigi
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17th Nov 05 at 14:40   View User's Profile U2U Member Reply With Quote

2.1
Lawrah
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17th Nov 05 at 14:40   View Garage View User's Profile U2U Member Reply With Quote

http://science.widener.edu/svb/tutorial/sigfigures.html
Ally
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17th Nov 05 at 14:40   View User's Profile U2U Member Reply With Quote

2.04
gianluigi
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17th Nov 05 at 14:41   View User's Profile U2U Member Reply With Quote

2 significant figures means 2 digits not 3
Lawrah
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17th Nov 05 at 14:42   View Garage View User's Profile U2U Member Reply With Quote

therefor do you not round down the 4...
Ally
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17th Nov 05 at 14:42   View User's Profile U2U Member Reply With Quote

thought it ment significant numbers after the decimal place
dna23
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17th Nov 05 at 14:43   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by gianluigi
2 significant figures means 2 digits not 3


0 is not considered a significant figure unless between another digit but with this ending in a 0 you have to take the next digit to include it... something like that
CCA
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17th Nov 05 at 14:44   View User's Profile U2U Member Reply With Quote

To one decimal place it would be 2.0, i think
Tom
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17th Nov 05 at 14:44   View User's Profile U2U Member Reply With Quote

2.04, so 2.0
gianluigi
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the way i did it was the 9 will round the 6 up to 7, the 7 will round the 4 upto 5 and the 5 will round the 0 upto 1,

i was taught that you round 5 up
stuartmitchell
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17th Nov 05 at 14:44   View User's Profile U2U Member Reply With Quote

Ian will know
Edd
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17th Nov 05 at 14:44   View User's Profile U2U Member Reply With Quote

2.0
dna23
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quote:
Zeros to the left of a significant figure and not bounded to the left by another significant figure are not significant. For example the number 0.01 only has one significant figure.
dna23
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17th Nov 05 at 14:45   View User's Profile U2U Member Reply With Quote

your all doing decimal places, they dont work the same as measured/exact significant figures.
gianluigi
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17th Nov 05 at 14:46   View User's Profile U2U Member Reply With Quote

i have forgotten all my maths and statistic lessons this is worrying
Carl
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17th Nov 05 at 14:46   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by stuartmitchell
I thought rounding occured after the deciaml place so in this instance it would be 2.05

This is becasue the 4th number ie 6 is >5 therefore you round the 3rd number ie 4 up to 5 hence

2.05

[Edited on 17-11-2005 by stuartmitchell]


I agree with this.

[Edited on 17-11-2005 by Carl]
Lawrah
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17th Nov 05 at 14:48   View Garage View User's Profile U2U Member Reply With Quote

quote:
Originally posted by gianluigi
the way i did it was the 9 will round the 6 up to 7, the 7 will round the 4 upto 5 and the 5 will round the 0 upto 1,

i was taught that you round 5 up


hhaahaha
stuartmitchell
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17th Nov 05 at 14:48   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Carl
quote:
Originally posted by stuartmitchell
I thought rounding occured after the deciaml place so in this instance it would be 2.05

This is becasue the 4th number ie 6 is >5 therefore you round the 3rd number ie 4 up to 5 hence

2.05

[Edited on 17-11-2005 by stuartmitchell]


I agree with this.

[Edited on 17-11-2005 by Carl]


Tom
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17th Nov 05 at 14:48   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Carl
quote:
Originally posted by stuartmitchell
I thought rounding occured after the deciaml place so in this instance it would be 2.05

This is becasue the 4th number ie 6 is >5 therefore you round the 3rd number ie 4 up to 5 hence

2.05

[Edited on 17-11-2005 by stuartmitchell]


I agree with this.

[Edited on 17-11-2005 by Carl]


This seems to easy though, I am scpetical of my own logic so usually pick the one I think to be wrong
gianluigi
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17th Nov 05 at 14:48   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Lawrah
quote:
Originally posted by gianluigi
the way i did it was the 9 will round the 6 up to 7, the 7 will round the 4 upto 5 and the 5 will round the 0 upto 1,

i was taught that you round 5 up


hhaahaha


what?
Lawrah
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17th Nov 05 at 14:50   View Garage View User's Profile U2U Member Reply With Quote

Thats the most rediculous thing i have ever heard...

Rule 1- if the remainder beyond the last digit to be reported is less than 5, drop the last digit. Rounding to one decimal place, the number 5.3467 becomes 5.3.


Rule 2-if the remainder is greater than 5, increase the final digit by 1. The number 5.798 becomes 5.8 if rounding to 1 digit.


Rule 3- To prevent rounding bias, if the remainder is exactly 5, then round the last digit to the closest even number.Thus the number 3.55 (rounded to 1 digit) would be 3.6 (rounding up) and the number 6.450 would round to 6.4 (rounding down)if rounding to 1 decimal.
See page 12 in Hurlburt, R. (1994) Comprehending Behavioral Statistics, Brooks/Cole, Pacific Grove, CA.

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