Percent Change and Error

Front

What is percent error?

Back

Percent error is a measure of how inaccurate a measurement is, expressed as a percentage of the difference between the estimated value and the actual value.

Front

How do you calculate percent error?

Back

Percent Error = |(Estimated Value - Actual Value)| / Actual Value × 100%.

Front

What is the formula for percent change?

Back

Percent Change = (New Value - Old Value) / Old Value × 100%.

Front

If a value increases from 50 to 75, what is the percent change?

Back

Percent Change = (75 - 50) / 50 × 100% = 50% increase.

Front

If a value decreases from 200 to 150, what is the percent change?

Back

Percent Change = (150 - 200) / 200 × 100% = -25% decrease.

Front

What does a positive percent change indicate?

Back

A positive percent change indicates an increase in value.

Front

What does a negative percent change indicate?

Back

A negative percent change indicates a decrease in value.

Front

Calculate the percent error if the estimated value is 80 and the actual value is 70.

Back

Percent Error = |(80 - 70)| / 70 × 100% = 14.29%.

Front

Calculate the percent change from 60 to 90.

Back

Percent Change = (90 - 60) / 60 × 100% = 50% increase.

Front

Calculate the percent change from 100 to 75.

Back

Percent Change = (75 - 100) / 100 × 100% = -25% decrease.