Statistics applied to Quality Control

Statistics applied to Quality Control

1. "basic tool"

   • Check Sheet
     • Pareto Charts
       • Vilfredo Pareto
         • bars / line graph
           • where individual values are represented in descending order by bars, and the cumulative total is represented by the line
     • Control(Run) Charts
       • also known as
         • Shewhart charts
         • Process-behaviour charts
         • In statistical process control are tools used to determine whether or not a manufacturing or business process is in a state of statistical contro
           • chart that allows significant change to be differentiated from the natural variability of the process.
           • Under control
             • Stable
               • Can be used to predict the future performance of the process
           • Not in control
             • Determine the sources of variation
             • Eliminated to bring the process back into control
     • Flow Charts
       • graphical representation of an algorithm or process
         • type of step
           • rectangles, ovals, diamonds and numerous other shapes
         • establish flow and sequence
     • Scatter Plots
       • Cartesian coordinates
         • two variables
           • positive correlation
             • lower left to upper right
           • negative correlation
             • upper part left to the bottom right
     • Cause and Effect Diagrams
       • Ishikawa y Fishbone Diagrams
         • 1940
           • they are employed to identify the underlying symptoms of a problem or “effect” as a means of finding the root cause
             • causes of a problem
             • spines
               • the effect at one end
               • The causes
               • brainstorming
     • collecting data
       • the quick
         • easy
           • efficient
       • information
         • quantitative
           • tally sheet
         • qualitative
       • checks
       • a typical check sheet is divided into regions, and marks made in different regions have different significance
       • 5 Basic types
         • Classification
         • Location
         • Frequency
         • Measurement Scale
         • Check List

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