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For Variables: Mean Control Chart - Coggle Diagram
For Variables: Mean Control Chart
When the process mean (µ) and standard deviation
(σ) are
known
The standard deviation of sample means (X-bar)
Setting Chart Limits
For x-Charts when we know
For x-Charts when we don’t know
Setting Control Limits
For x-Charts when we know
For x-Charts when we don’t know
Mean and Range Charts
R - Chart
Shows sample ranges over time
Difference between smallest and
largest values in sample
Monitors process variability
Type of variables control chart
Independent from process mean
Setting Chart Limits
Setting Control Limits
When the process mean (µ) and standard deviation
(σ) are
unknown
Collect multiple samples
Calculate sample averages ( ’s) and ranges (R’s)
Calculate grand average ( ) and average of the
ranges ( );
Use Table S6-1 to find A2, D3, and D4
Calculate UCL’s and LCL’s for the mean and range