You drive to school every day.This can be viewed as a process.It takes you approximately 15 minutes to get from your apartment to school,but the exact time varies from day to day.Which of the following would be considered special cause variation?
A)The number of red traffic lights you encounter
B)A major accident along the route you take ties up traffic for a long period of time
C)Getting stuck behind a car going under the speed limit for a few blocks
D)Driving to work in a heavy rain storm

Question

Quizplus · Accepted Answer

A major accident along the route causing traffic to be tied up for a long period of time is an example of special cause variation because it is an unusual event that is outside of the normal range of variation for the process of driving to school every day. The other options, such as encountering red traffic lights or driving in heavy rain, are within the normal range of variation and are considered common cause variation.

You Drive to School Every Day