Please enable JavaScript.
Coggle requires JavaScript to display documents.
Managerial Issues and Control Charts - Coggle Diagram
Managerial Issues and Control Charts
Three major management decisions
Determine the appropriate charting technique
Set clear policies and procedures
Select points in the processes that need SPC
Type of Control Chart
Variables Data
x-chart & R-chart
Observations are variables
Collect 20 - 25 samples of n = 4, or n = 5, or more, each from a stable process and compute the mean for the x-chart and range for the R-chart
Track samples of n observations each
Attribute Data
p-chart
We deal with fraction, proportion, or percent defectives
Observations are attributes that can be categorized in two states
Have several samples, each with many observations
c-Chart
Observations are attributes whose defects per unit of output can be counted
The number counted is a small part of the possible occurrences
Defects such as number of blemishes on a desk, number of typos in a page of text, flaws in a bolt of cloth
Pattern in Control Chart