MATM 2

    Cards (15)

    • Measure of central tendency
      To describe a whole set of data with a single value that represents the middle or centre of its distribution
    • Central tendency
      A way to describe the center of a data set
    • Central tendency importance
      • It lets us know what is normal or 'average' for a set of data
      • It condenses the data set down to one representative value, useful when working with large amounts of data
      • Allows comparison of one data set to another and one piece of data to the entire data set
    • Main measures of central tendency
      • Mean or Arithmetic mean or average
      • Median
      • Mode
    • Mean or Arithmetic mean

      The sum of all values in the observation or dataset divided by the total number of observations
    • Mean or Arithmetic mean influence
      • Influenced by outliers and skewed distributions
      • Applicable for ratio and interval data
    • Mean can be used for both continuous and discrete numeric data as well as for categorical data
    • Find the mean
      Sum all values and divide by the total number of observations
    • Median
      The physical middle point in a distribution, dividing the distribution in half when values are arranged in ascending or descending order
    • Median importance
      • Preferred measure of central tendency when the distribution is not symmetrical
      • Less affected by outliers and skewed data than the mean
      • Widely used for ordinal type of information
    • Median cannot be identified for categorical nominal data
    • Find the median
      Arrange values in ascending or descending order, then find the one in the center
    • Mode
      The most commonly occurring value in a distribution
    • Mode limitations
      • There can be more than one mode (bi-modal, or multi-modal)
      • In some cases, the distribution may have no mode at all
      • Mode may not be suitable if all values are different
    • Find the mode
      Simply find the most recurring value
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