Measure Phase and Statistics Flashcards
7 cards from real Lean Six Sigma Green Belt Certification practice questions. Tap to flip, then mark Knew It or Still Learning โ missed cards come back until you master them.
Read the first 7 Measure Phase and Statistics flashcards as text
What is the purpose of a box plot (box-and-whisker plot) in data analysis?
Answer: To show the five-number summary and identify outliers
A box plot displays the minimum, Q1, median, Q3, and maximum, providing a visual summary of distribution shape and outliers.
During the Measure phase, a SIPOC diagram is primarily used to:
Answer: Provide a high-level view of the process and its boundaries
SIPOC maps Suppliers, Inputs, Process, Outputs, and Customers to establish scope and context before detailed measurement begins.
Which term describes the smallest detectable difference that a measurement instrument can reliably distinguish?
Answer: Resolution (discrimination)
Resolution (or discrimination) is the smallest increment a gauge can detect; it should be at least 1/10 of the total process variation.
A process collects data at regular intervals regardless of lot boundaries. This describes which sampling method?
Answer: Systematic sampling
Systematic sampling selects every nth unit at fixed intervals, making it time- or production-based rather than random at each draw.
If a process has a long-term sigma level of 3.0, what is the approximate DPMO?
Answer: 66,807
A 3-sigma process (long-term, with 1.5ฯ shift) corresponds to approximately 66,807 DPMO.
What is the interquartile range (IQR) used to measure?
Answer: The spread of the middle 50% of data
IQR = Q3 - Q1, capturing the spread of the central 50% of the data while ignoring extreme values.
In a measurement system analysis, 'linearity' refers to:
Answer: Variation in bias across the operating range of the gauge
Linearity assesses whether the gauge bias is consistent across all values in its expected operating range.