Here is the resource that I was reading in order to understand the uncertainty at an introductory level: http://study.kis.net.ua/pluginfile.php/58076/mod_resource/content/1/Errors%20%20Uncertainty%20Notes.pdf
I have two questions about it. It says: 'Sometimes you hear that uncertainties should generally be reported as ½ the least count; this is technically correct. But since they should be reported with the same # of decimal places as the instrument, in practice this amounts to stating them as ± the least count.'
By that logic, the uncertainty of a meter rule can be stated both as +/-1mm and 1mm. This seems wrong. What am I missing here?
My attempts to decipher what this phrase means have been futile: 'If the number of decimal places in your uncertainty does not match the measurement, round your uncertainty up so that it does. In most cases, you do this anyway – only when you are reporting a value beyond the least count would you not do this. Decimal uncertainties always have 1 significant figure.'
My problem is not knowing any examples of these two statement. May those who answer please provide examples?