1. Accuracy
- refers to the agreement between experimental data and a known value.
- how close to the actual or true accepted value are the measurement
- you can think of it in terms of a bulls-eye in which the target is hit close to the center, yet the marks in the target aren't necessarily close to each other.
2. Precision
- refers to how well experimental values agree with each other
- how close are the individual measurements to one another
- if you hit a bulls-eye precisely, then you are able to hit the same spot on the target each time, even though that spot may be distant from the center
3. True Value
- a given measurement that is set by the experts (i.e. scientists, professors, etc.)
4. Experimental Value
- the value gathered by the performer
How to Compute For The Percent Error
% Error=(True Value-Experimental Value)
TV X100
Exercises
1. While doing an experiment, you were asked to measure a square block that was given to you. Each side was 15.72 cm. In your 3 trials you got: 15.23 cm , 14.92 cm & 15.57 cm, an average of 15.24 cm. Find the percent error.
=(15.72-15.24)/15.72 X 100
=o.48/15.72X100
=o.0305X100
% error=3.05%
2. In an experiment, you were asked to find out the measurement of a liquid inside the glass beaker. You had 3 trials in which you got: 25.32 ml, 27.45 ml & 26.24, having an average of 26.34 ml. The true value was 27.50 ml. Find the percent error.
=(27.50-26.34)/27.50 X 100
=1.16/27.50 X 100
=o.0422X100
% error= 4. 22%
3. You were inside a pet store when you saw puppies. You had estimated that there were 14 of them, though they were 15. Find the percent error.
=(15-14)/15 X 100
=1/15 X 100
= o. 0667X 100
% error= 6.67%
4. While walking outside your house, you saw pink petals scattered everywhere. You estimated that there were 50 of them, when there was 52 petals. Find the percent error.
=(52-50)/52 X 100
=2/52 X 100
=0.0385 X 100
% error= 3.85 %
5. While conducting an experiment, you were to measure a piece of block given to you. You had 4 trials to measure the block. You had arrived with these results: 14.25 cm, 14.26 cm, 14. 22 cm & 14. 23 cm. The true value was 14. 26 cm. What is your percent error?
=(14.26-14.24)/14.26 X 100
=o.o2/14.26 X 100
=0.0014 X 100
% error= 0.14 %
Members:
Cruz
Gonzales, I.
Mariano
Pineda
Sarmiento
% Error=(True Value-Experimental Value)
TV X100
Exercises
1. While doing an experiment, you were asked to measure a square block that was given to you. Each side was 15.72 cm. In your 3 trials you got: 15.23 cm , 14.92 cm & 15.57 cm, an average of 15.24 cm. Find the percent error.
=(15.72-15.24)/15.72 X 100
=o.48/15.72X100
=o.0305X100
% error=3.05%
2. In an experiment, you were asked to find out the measurement of a liquid inside the glass beaker. You had 3 trials in which you got: 25.32 ml, 27.45 ml & 26.24, having an average of 26.34 ml. The true value was 27.50 ml. Find the percent error.
=(27.50-26.34)/27.50 X 100
=1.16/27.50 X 100
=o.0422X100
% error= 4. 22%
3. You were inside a pet store when you saw puppies. You had estimated that there were 14 of them, though they were 15. Find the percent error.
=(15-14)/15 X 100
=1/15 X 100
= o. 0667X 100
% error= 6.67%
4. While walking outside your house, you saw pink petals scattered everywhere. You estimated that there were 50 of them, when there was 52 petals. Find the percent error.
=(52-50)/52 X 100
=2/52 X 100
=0.0385 X 100
% error= 3.85 %
5. While conducting an experiment, you were to measure a piece of block given to you. You had 4 trials to measure the block. You had arrived with these results: 14.25 cm, 14.26 cm, 14. 22 cm & 14. 23 cm. The true value was 14. 26 cm. What is your percent error?
=(14.26-14.24)/14.26 X 100
=o.o2/14.26 X 100
=0.0014 X 100
% error= 0.14 %
Members:
Cruz
Gonzales, I.
Mariano
Pineda
Sarmiento
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