Control Chart Champion: Process Monitoring Simulator

X̄ Chart — Avg Weight (g)✓ In Control

UCL: 155g · CL: 150g · LCL: 145g

R Chart — Range (g)✓ In Control

UCL: 12g · CL: 6g · LCL: 0g

💼 Interview Tip"I monitor BOTH X̄ and R charts simultaneously. A stable mean means nothing if variability is spiking — the R chart catches that."

🍔

Burgers Produced

Quality Score100%

Defects Shipped0

False Alarms0

Correct Catches0

Cost Impact$0

Point beyond UCL/LCL

Run of 7+ same side

Trend 6+ up or down

Erratic zigzag

Signal detected. Choose wisely!

💼 When to ActCommon-cause variation is normal — don't overreact! Only investigate when rules are violated. False alarms cost ~$500.

📊 How to Play

🎯 Objective

You're quality manager at BurgerWorks. Watch X̄ & R charts. Catch real problems fast, but don't cry wolf!

📈 Charts

X̄: Average weight of 5-burger samples → should stay near 150g

R: Range within each sample → should stay near 6g

🚨 Signals

Point beyond UCL or LCL

7+ points on ONE side of center

6+ points trending up or down

💰 Scoring

✅ Correct catch: +15 pts

❌ False alarm: −10 pts, +$500

❌ Missed defect: −5 pts, +$200

⚡ Events

Random special causes will appear — mean shifts, trends, increased variation. Stay sharp!

📊 Control Chart Champion