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Statistics Applied to Quality Control (Control (run) Charts (These are…
Statistics Applied to Quality Control
Control (run) Charts
Also known as Shewart charts or process-behaviour charts
Process parameters should never be
adjusted for a process that is in control, as this will result in degraded process performance
These are used to determine whether or not a manufacturing or business process is in a state of statistical control
If analysis of the control chart indicates that the process is currently under control, the data from the process can be used to predict the future performance of the process
If the chart indicates that the process being monitored is not in control, analysis of the chart can help determine the sources of variation, which can then be eliminated to bring the process back into control.
Check Sheet
It's a simple document that is useed for collecting data in real time at the location where the data is generated
Typically a blank form that is designed for the quick, easy, and efficient recording of the desired information, which can be either quantitative or qualitative.
5 basic types of check sheets
Frequency
Measurement scale
Location
Check list
Classification
Pareto Charts
is a type of chart that contains both bars an a line graph, where individual values are represented in descending order by bars, and the cumulative total is represented by the line
The purpose is to highlight the most important among a set of factors
Its purpose is to highlight the most important among a set of factors
Scatter Plots
Is used when a variable exists that is under the control of the experimenter
If a parameter exists that is systematically incremented or decremented by the other, it is called the control parameter or independent variable and is customarily plotted along the horizontal axis
The measured or dependent variable
is customarily plotted along the vertical axis
If no dependent variable exists, either type of variable can be plotted on either axis and a scatter plot will illustrate only the degree of correlation between two variables
Also is called scatter chart, scatter gram, scatter diagram or scatter graph
Is a type of mathematical diagram using castesian coordinates to display values for two variables for a set of data
Cause and Effect Diagrams
Are employed to identify the underlying symptoms of a problem or effect as a means of finding the root cause
This method forces the user to consider all the likely causes of the problem
Also combines brainstorming techniques with graphical analysis
Known as Ishikawa and Fishbone Diagrams
Other charts
Histogram
Stratified sampling
Deming cycle