Calculating Percent Error Concepts

In this video, Mr. J explains how to calculate percent error, a measure of accuracy in estimations or measurements. He provides a step-by-step example involving an event planner's guest estimate, demonstrating the calculation process: subtracting the actual value from the estimated value, taking the absolute value, dividing by the actual value, and converting the result to a percentage. The video concludes with a rounded percent error of 11% and offers additional resources for further learning.

What is the primary purpose of calculating percent error?

• To compare two different measurements

• To find the average of multiple measurements

• To assess the accuracy of a measurement or estimation

• To determine the exact value of a measurement

Which of the following is the first step in calculating percent error?

• Multiply the measured value by 100

• Subtract the actual value from the estimated value

• Divide the estimated value by the actual value

• Add the estimated and actual values

In the example problem, how many guests did the event planner estimate?

• 325

• 364

• 300

• 350

What is the absolute value of the difference between the estimated and actual number of guests in the example?

• 325

• 11

• 39

• 364

After finding the absolute difference, what is the next step in calculating percent error?

• Subtract from 100

• Multiply by 100

• Add the actual value

• Divide by the actual value

What is the decimal result of dividing 39 by 364 in the example?

• 0.107

• 0.11

• 0.39

• 0.364

How do you convert a decimal to a percentage?

• Divide by 100

• Multiply by 100

• Subtract 100

• Add 100

What is the percent error rounded to the nearest whole number in the example?

• 12%

• 11%

• 13%

• 10%

Why is the approximately symbol used in the final percent error result?

• Because the calculation is exact

• Because the calculation is incorrect

• Because the result is an estimate

• Because the result is rounded

What does a percent error of 11% indicate about the event planner's estimate?

• The estimate was 11% higher than the actual

• The estimate was off by approximately 11%

• The estimate was exactly correct

• The estimate was 11% lower than the actual