Question

A test taker makes an estimate for a 30-second time interval. The estimate is 34.5 seconds. What is the percent error in this example?

Answer 1

34.5 - 30 = 4.5 seconds is the error, or how much they are off

Divide this over the target value (30) to get 4.5/30 = 0.15 = 15%

Answer: 15% error