Module 10 Checkpoint: Non-Parametric Thinking and Assumption Caution
Scenario
Ten support tickets took 5, 6, 6, 7, 8, 9, 10, 11, 12 and 240 minutes. A report quotes the mean of 31.4 minutes.
Questions
- Why is the mean a poor summary of this set?
- What is the median, and what does it say instead?
- Give one reason the 240-minute ticket should be investigated rather than deleted.
- When would ranking the values be more honest than averaging them?
- Write the summary sentence you would send to a manager.
Pass Standard
You pass when you can say why ranks are more robust here, and can justify investigating the extreme value rather than removing it.