Quality Control-Statistic

Quality Control-Statistic

1. Defination

   • A collection of quantitative data pertaining to a subject or group.
   • The science that deals with the collection, tabulation, analysis, interpretation, and presentation of quantitative data
   • a set of concepts, rules, and procedures that help us to
     • organize numerical information in the form of tables, graphs, and charts
     • understand statistical techniques underlying decisions that affect our lives and well-being
     • make informed decisions.

2. Types of Data

   • Attribute
     • Binary in nature
       • Qualitative data
         • Good/bad; yes/no
   • Variable
     • Measurement information
       • Quantitative data
         • Discrete
           • information that can be categorized into a classification
           • based on counts
           • data that can’t be broken down into a smaller unit and add additional meaning
         • continuous
           • information that can be measured on a continuum or scale
           • any numeric value
           • data that can be measured and broken down into smaller parts and still have meaning

3. Accuracy and Precision

   • Accuracy
     • Determined by how close a measured value to its “true” value
   • Precision
     • Determined by how reproducible is the measurement value.

4. Describing Data

   • Graphical
     • Frequency Distribution
       • Histogram
         • Categorical frequency distributions
         • Ungrouped frequency distributions
         • Grouped frequency distributions
   • Analytical
     • Measures of Central Tendency
       • Average (Mean)
         • Ungrouped data
         • Group data
         • Weighted average
       • Median
       • Mode
         • The Mode is the value that occurs with the greatest frequency.
     • Measures of Dispersion
       • Range
       • Standard Deviation
       • Variance

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