Ch. 2   means to an end
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Ch. 2 means to an end

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    Ch. 2   means to an end Ch. 2 means to an end Presentation Transcript

    • Ch. 2 – Means to an End
      BEH383 – Week 1
    • Key Terms
      Measures of central tendency (averages):
      Mean
      Median
      Mode
    • Mean
      Most common type of average
      Calculated by adding all of the values up and then dividing the total by the number of values
      M is typically the symbol for mean, n is typically the symbol for sample size
    • Mean
      To calculate the mean, you add 2150 to 1534 to 3564 and divide the sum by 3 (n = 3)
      The mean is 2416
    • Weighted Mean
      When you have multiple occurrences of the same value in a data set
      Calculated as (value x frequency)/total frequency
    • Weighted Mean
      To calculate the weighted mean, divide (total value x frequency) by (total frequency)
      The weighted mean is 89.67
    • Median
      The median is simple the middle value when all values are arranged from highest to lowest
      In the data set, half (50%) of the values should fall above the median and half should fall below
      When there are an even number of values, the median is the mean of the two middlemost values
    • Median
      For odd-numbered data sets, select the middle value
      For even number data sets take the mean of the two middle values
      The median for the first data set is $42537.
      The median for the second data set is $42447.
    • Mean VS. Median
      Q: Why use the median as a measure of central tendency?
      A: Median is not sensitive to extreme scores (outliers)
    • Mean VS. Median
      The mean for this data set is $50056.
      The median is $42537.
    • Mode
      Mode is, very simply, the most frequently occur piece of data in the set
      In this data set, the mode is Brown hair