Statistics

Statistics

1. The practice of collecting and analysing numerical data in large quantities.

   • Variables
     • Quantitative variable
       • Variables that are numerical
         • Continous variables
           • Variables that would take forever to count. Normally numbers with decimals.
         • Discrete variables
           • Variables that are possible to count, as whole numbers.
     • Qualitative variables
       • Variables that are not numerical, normally presented as words.
   • How to represent data?
     • Histogram
       • A diagram consisting of rectangles whose area is proportional to the data.
     • Pie chart
       • A type of graph in which a circle is divided into sectors that each represents a proportion of the whole.
   • Who?
     • Sample
       • Set of individuals selected from a statistical population by a defined procedure
     • Population
       • Total set of observations