Physics 101.1 Activity 2: Error and Error Propagation

Before we had this activity, I thought that error was just a term that means mistake or wrong but after our meeting, I learned that it has deeper meaning when it comes to measurements.
Here are some things that I learned:
1. Error denotes how FAR a measured value with respect to a REFERENCE VALUE.
2. There are two types of error: (a) uncertainty which is the error between trials and (b) deviation which is the error between the measured values and an accepted value.
3. Uncertainty is the absolute value of the difference between the maximum measured value and the mean of the data. It is used for Second Order of Approximation.
4. Deviation is the absolute value of the difference between the mean of the data and the accepted value.
5. Uncertainty happens when something is measured with many trials but with different results. Deviation happens when it has wrong zero reading or the experimental data is taken different from the standard of the accepted value.
6. Absolute Error is the actual absolute difference between the measured value and the reference value whereas Relative Error is a number that describes how large an error value compared to the reference value.
7. Precision - how close the measured values to each other.
8. Accuracy - how close the measured values to the standard value.
9. Precise=Less Uncertainty; Accurate=Less Deviation.
10. It was REALLY easier to describe precision and accuracy through the “dartboard” representation.
11. A measurement is said to be acceptable if the uncertainty is greater than or equal to the deviation.
12. Error propagation happens when a value is obtained not by measurement but by solving using measured quantities.
13. The Principle of Maximum Pessimism states that the error of computed quantities MUST be greater than or equal to error of the individual quantities used to obtain it.
(I found the principle of maximum pessimism funny because I thought of it in a different way. Somehow I thought it meant the greatest pessimistic outlook in life.)
14. Some rules apply for getting Error Propagation such as Addition, Subtraction, Multiplication, Division and Exponents.
I was a bit confused with error propagation but then I found it on the handouts. Maybe I should read it more for better comprehension. :D