Percent Change and Percent Error

Calculate the percent change if the initial value is 50 and the final value is 75.

• 50%

• 25%

• 55%

• 100%

Calculate the percent change if the initial value is 80 and the final value is 60.

• Decrease of 40%

• Decrease of 30%

• Increase of 25%

• Decrease of 25%

Calculate the percent change if the initial value is 120 and the final value is 150.

• 20%

• 30%

• 25%

• 40%

Calculate the percent change if the initial value is 200 and the final value is 180.

Calculate the percent error if the measured value is 8 and the accepted value is 10.

• 25%

• 10%

• 15%

• 20%

Calculate the percent error if the measured value is 15 and the accepted value is 12.

• 20%

• 10%

• 15%

• 25%

Calculate the percent error if the measured value is 40 and the accepted value is 35.

• 12.5%

• 25%

• 14.29%

• 20%

Calculate the percent error if the measured value is 90 and the accepted value is 100.

• 5%

• 15%

• 20%

• 10%

Which is a better indicator of accuracy, percent change or percent error?

• relative error

• absolute error

• percent change

• percent error

When calculating percent change, what does a positive value indicate?

• decrease or decline

• no change

• increase or growth

• error or invalid data