Ch. 2   means to an end
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  • 1. Ch. 2 – Means to an End
    BEH383 – Week 1
  • 2. Key Terms
    Measures of central tendency (averages):
    Mean
    Median
    Mode
  • 3. 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
  • 4. Mean
    To calculate the mean, you add 2150 to 1534 to 3564 and divide the sum by 3 (n = 3)
    The mean is 2416
  • 5. Weighted Mean
    When you have multiple occurrences of the same value in a data set
    Calculated as (value x frequency)/total frequency
  • 6. Weighted Mean
    To calculate the weighted mean, divide (total value x frequency) by (total frequency)
    The weighted mean is 89.67
  • 7. 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
  • 8. 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.
  • 9. Mean VS. Median
    Q: Why use the median as a measure of central tendency?
    A: Median is not sensitive to extreme scores (outliers)
  • 10. Mean VS. Median
    The mean for this data set is $50056.
    The median is $42537.
  • 11. Mode
    Mode is, very simply, the most frequently occur piece of data in the set
    In this data set, the mode is Brown hair