Nancy Brim
Name _____________________________________ Period _____ Date _________________PERCENT ERROR, ACCURACY, AND PRECISION PRACTICEDraw FOUR (4) dots on each of the target diagrams below, representing the indicated levels of accuracy and precision.A measurement was taken three times. The correct measurement was 68.1mL. For each data trial, circle whether the set of measurements is accurate, precise, both, or neither.TRIAL A: 78.1mL, 43.9mL, 2mLaccurateprecisebothneitherTRIAL B: 68.1mL, 68.2mL, 68.0mLaccurateprecisebothneitherTRIAL C: 98.0mL, 98.2mL, 97.9mLaccurateprecisebothneitherTRIAL D: 72.0mL, 60.3mL, 68.1mLaccurateprecisebothneitherWrite the formula for percent error in the space below.In the formula you wrote in #3, what is the experimental value? The expected value?For each of the following experiments described below, calculate the percent error. Show your work. This means that you write the formula, plug in the numbers with units, and then solve.A student measured the string as 1.3m long. The teacher said it was actually 2.1m long. What was the student’s percent error? The teacher said the volume of liquid was 500.0mL. When measured, a student found it was 499.7mL. What was the student’s percent error?A standard mass of 250.0g was placed on a balance. The balance said it had a mass of 243.9 grams. What is the balance’s percent error? When conducting an experiment, what kinds of data do you think we should strive for (accurate, precise, both)? Why? Why do you think it is valuable to know the percent error for our data? Which do you think is most important in a data set: accuracy or precision? Why? ................
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