Percent Change and Error

Front

What is percent change?

Back

Percent change is a way to express a change in a quantity as a percentage of the original amount. It is calculated using the formula: ((new value - old value) / old value) x 100.

Front

How do you calculate percent error?

Back

Percent error is calculated using the formula: (|experimental value - theoretical value| / theoretical value) x 100.

Front

What does a positive percent change indicate?

Back

A positive percent change indicates an increase in the value of a quantity.

Front

What does a negative percent change indicate?

Back

A negative percent change indicates a decrease in the value of a quantity.

Front

If a quantity decreases from 100 to 80, what is the percent change?

Back

The percent change is -20% (a 20% decrease).

Front

If a student's predicted score was 85 and the actual score was 90, what is the percent error?

Back

The percent error is 5.88%.

Front

What is the formula for calculating percent error?

Back

Percent error = (|actual value - predicted value| / predicted value) x 100.

Front

If a temperature was predicted to be 75 degrees but was actually 70 degrees, what is the percent error?

Back

The percent error is 6.67%.

Front

What is the difference between percent change and percent error?

Back

Percent change measures the relative change in a quantity, while percent error measures the accuracy of a prediction or measurement compared to the actual value.

Front

If a car's value decreased from $20,000 to $15,000, what is the percent change?

Back

The percent change is -25%.