Q:2-A Lean Six Sigma team is trying out a new forming tool to reduce variability in a process that creates hamburgers patties in a fast food restaurant. One of the significant dimensions has a process standard deviation of 0.35 mm. The team needs to know how many samples to collect in order to achieve an estimate of the mean with precision of + or - 0.15 mm, with 95% confidence. What sample size is required to meet this goal?
Mark one answer:
21
12
42
84
65
Q:3-What is the purpose of a Scatter Plot Diagram, and in what phase of the DMAIC cycle is it most frequently used?
Mark one answer:
Visually display the relationship between several variables, Define
Quantify the relationship between two variables, Improve
Evaluate the stability of a process, Measure
Visually display the dispersion, or spread, of a process, Analyze
Visually display the relationship between two variables, Analyze
Q:4-Two variables (A & B) have a correlation coefficient (r) of 0.74. Which of the following is a true statement?
Mark one answer:
The coefficient of determination is 0.86.
There is a strong causal relationship between the two variables.
Variation in one variable accounts for 55% of the variation in the other.
Variation in A causes variation in B with 74% confidence.
Q:5-Which of the following is a primary use of Fishbone Cause and Effect Charts?
Mark one answer:
Provide a project road map.
Quantify relationships between input and output.
Show process performance over time.
Categorize process inputs by department.
Identify potential root causes of variability.