Statistics applied to Quality ControI

Statistics applied to Quality ControI

1. Edward Deming

   • Formalized the Basic Tools of Quality Control .
     • Histograms
       • are used to plot density of data, and often for density estimation: estimating the probability density function of the underlying variable
       • are used to plot density of data, and often for density estimation: estimating the probability density function of the underlying variable
     • Control (Run) Charts
       • are tools used to determine whether or not a manufacturing or business process is in a stat of statistical control
     • Scatter Plots
       • Is a type of mathematical diagram using Cartesian coordinates to display values for two variable s for a set of data
       • can suggest various kinds of correlations between variables with a certain confidence interval . Correlations may be positive, negative, or null
       • Is a type of mathematical diagram using Cartesian coordinates to display values for two variable s for a set of data
       • can suggest various kinds of correlations between variables with a certain confidence interval . Correlations may be positive, negative, or null
     • Check Sheet
       • is used for collecting data in real - time and at the location where the data is generated
         • 5 Basic types of Check Sheets
           • Classification
           • Location
           • Frequency
           • Measurement Scale
           • Check List
     • Pareto Charts
       • is a type of chart that contains both bars and a line graph , where individual values are represented in descending order by bars, and the cumulative total is represented by the line.
       • is a type of chart that contains both bars and a line graph , where individual values are represented in descending order by bars, and the cumulative total is represented by the line
     • Cause and Effect Diagrams
       • First used by Ishikawa in the 1940 ́s
       • forces the user to consider all the likely causes of a problem,
     • Flow Charts
     • Stratified sampling
       • is the process of dividing members of the population into homogeneous subgroups before sampling
       • Is a method of sampling from a population