I can compare the variation of two designs and connect lower standard deviation to greater consistency.
POE Unit 4 • Lesson 4.6
Standard Deviation and Design Consistency
Focus question: How can standard deviation distinguish two designs that have the same average performance?
Mission Briefing
Today’s Plan
A focused sequence that advances the mission-performance investigation.
Opening promptConcept modelGuided practiceInteractive applicationEvidence checkExit ticket
Lesson Targets
What You Will Be Able to Do
Consistency comparison using standard deviation
The comparison considers both mean and spread and identifies the more repeatable design.
Activity Flow
How the Lesson Moves
Each step builds the data, motion, or testing reasoning required for today’s deliverable.
1. Compare centers
Determine whether the designs have similar average performance.
2. Compare spread
Calculate or interpret standard deviation.
3. Make the decision
Select the design that best meets consistency requirements.
Lesson Interactive
Choose the More Consistent Design
Apply the lesson concept to a mission-performance scenario. Use the feedback to correct your reasoning before completing the main deliverable.
Two Guidance Designs
Design A: 98, 100, 102, 100, 100 cm
Design B: 90, 96, 100, 104, 110 cm
Both designs have an average of 100 cm.
Compare how tightly each set clusters around the common mean of 100 cm.
Today’s Work
Main Deliverable
Consistency comparison using standard deviation
Create one focused engineering artifact that demonstrates today’s learning.
- Report the mean and standard deviation for both designs.
- Write a design recommendation that references consistency and mission requirements.
Exit Ticket
Mission Debrief
State the most important data-analysis or motion concept from today in your own words.
Name the measurement, calculation, graph feature, or test decision that supports your conclusion.
Identify one uncertainty, limitation, or next test that would strengthen the evidence.
Resources
Lesson Resources
Lesson 4.6 PowerPoint
Use the presentation to review the lesson concepts, examples, and activity directions.
Principles of Engineering
Return to the POE course hub for units, resources, certifications, and course information.
Mission Data Investigation
Use the integrated investigation context when connecting trial design, statistics, kinematics, graphs, and recommendations.