Measured:
* Directly obtained through observation: You use a tool or instrument to directly gather data from the real world.
* Affected by error and precision of the tool: The accuracy of the measurement depends on the quality of the tool and the skill of the measurer.
* Examples: Measuring a room's length with a tape measure, weighing an object on a scale, measuring temperature with a thermometer.
Calculated:
* Derived from existing information: You use formulas, equations, or algorithms to derive a value from other known values.
* Based on assumptions and models: The accuracy of the calculation depends on the accuracy of the input data and the validity of the model used.
* Examples: Calculating the area of a rectangle using length and width, calculating the speed of an object using distance and time, calculating the volume of a sphere using its radius.
Here's a simple analogy:
Imagine you want to know how many apples are in a basket.
* Measured: You count the apples one by one. This is a direct measurement.
* Calculated: You know the basket holds 10 apples per layer and there are 3 layers. You calculate the total number of apples as 10 x 3 = 30. This is a calculated value.
In summary:
* Measured: You directly gather information from the real world.
* Calculated: You use existing information to derive a new value.
