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energy
In a fraction they must be in the same units. In a ratio they need not be.
Measure the depth and width using the same units. Divide the depth measurement by the width measurement.
No. Measurement units are defined by and conversely. So the same units necessarily means same dimensions.
They don't have to have the same value but they have to be in the same measurement units if, for example, you are multiplying the values to find the area of a rectangle.
energy
Units
The same units as the mean itself. If the units of the mean, are, for example miles; then the error units are miles.
Yes
no watt is a measurement of power where as if you meant joule that is a measurement of energy which are not the same thing
In a fraction they must be in the same units. In a ratio they need not be.
The two units are the same measurement.
Yes but the units of measurement are different.
Measure the depth and width using the same units. Divide the depth measurement by the width measurement.
In order to subtract or add data you must make sure it has the same units.
Standard deviation has the same unit as the data set unit.
No. Measurement units are defined by and conversely. So the same units necessarily means same dimensions.