Percent Error and Change Concepts

The video tutorial covers the concept of percent of error, its relation to percent change, and its application in statistics and science. It explains how to calculate percent of error with practical examples, emphasizing the importance of precision in mathematical calculations, particularly with pi. The tutorial also includes exercises to reinforce learning.

What is the main difference between percent of change and percent of error?

• Percent of change is used in science, while percent of error is used in math.

• Percent of change involves original values, while percent of error involves correct values.

• Percent of change is always positive, while percent of error can be negative.

• Percent of change is calculated using addition, while percent of error uses subtraction.

In the example of Santos' walking time, what was the percent change in his walking speed?

• 62.5%

• 37.5%

• 25%

• 50%

When calculating percent of error, which value is considered the 'correct' amount?

• The smaller value

• The estimated value

• The theoretical value

• The larger value

In the parking lot example, what was the percent of error when 240 spaces were reported but only 200 were counted?

• 25%

• 20%

• 30%

• 16.67%

How is percent of error used in scientific experiments?

• To calculate the speed of an object

• To measure the distance between two points

• To compare experimental results with theoretical expectations

• To determine the accuracy of a stopwatch

In the physics experiment example, what was the percent error in Randy's acceleration measurement?

• 1%

• 2%

• 3%

• 4%

What is the correct value of pi used in seventh grade calculations?

• 3.1415926

• 3.14

• 3.14159

• 3.141

If Zoey thought she walked 20 miles but actually walked 16, what is her percent of error?

• 30%

• 25%

• 35%

• 20%

A student estimated a mass to be 250 grams, but the actual mass was 240 grams. What is the percent error?

• 5%

• 4.2%

• 6%

• 7%

If you estimated a repair cost to be $80 but it was actually $120, what is the percent error?

• 40%

• 50%

• 60%

• 33.33%