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Different significant digits in uncertainty and data?

  • Thread starter PChar
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  • #1
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Hi, I've just got a question about uncertainties that came up while doing a lab report.

I have a set of data for currents required to cancel the deflection of an electron beam caused by the earth's magnetic field:

0.195 A
0.220 A
0.250 A
0.251 A
0.239 A

Because of the difficulty in measuring the straightness of the beam, my lab partner and I decided on an uncertainty of +/-0.05 A.

Do I need to round the currents to one less decimal place because of my uncertainty, or can I keep everything as is?
 

Answers and Replies

  • #2
Redbelly98
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Welcome to PF.

If ±0.05 A is the uncertainty in each individual measurement, then yes, I would report the measurements to just 2 decimal places.
 

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