The difference between a measurement and an estimation is that a measurement is an exact data while an estimation is a guess as to what something may measure. For example, you can use a ruler to get the exact measurements of a piece of paper. However, if you don't have a ruler, you can make an educated guess as to what the paper's length and width measurements may be.
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diferece between ratio and regression
4 sig figs the ending zero is not significant unless it was a measurement and the zero was an estimation that was part of the measurement.
It means to guess at something. An imprecise amount or measurement.
It is measurement on an ordinal scale. Level 1 is less than level 2 which is less than level 3 and so on. But the difference between levels 1 and 2 is not related to the difference between levels 2 and 3, etc.
Where you order the measurements according to some rule but there is no straightforward relationship between the categories. For example, with measurements classified as: short, medium, tall. It is not possible to say whether the difference between medium and short is smaller than/equal to/larger than the difference between tall and medium.