Percent Error - New York Science Teacher
Percent Error
Lets face it, we are all not perfect, although some of you think you may be. Fortunately for us scientists came up with a way to figure out how wrong we are when we make mistakes. What they came up with was something called percent error. We are going to figure out your percent error in the following activities.
PE=Observed value-Actual Value X 100
Actual value
In front of you there are three cups. In each cup there are a number of skittles(do not eat them yet). Estimate how many skittles there are in each cup, don’t look, just shake the cup. Write these numbers down, this is your observed value. Now count how many skittles there are in each cup. Write these numbers down, this is the actual value. Now calculate the percent error for each of the cups. Use the space below to calculate your answers.
Now estimate how many drops of water can fit onto the top of a penny. Write it down. Next use the dropper to see how many will fit onto the penny before the water starts to run off. Write this number down. Use the space below to calculate the percent error.
Practice: Estimated Value = 2.5 cm Estimated Value= 5.32 g
Actual Value = 2.76 cm Actual Value = 5.54g
Percent Error = Percent Error =
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