Quantitative Data Analysis

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  • Descriptive Statistics
    • Measures of Central Tendency
      • Mean
        • calculated by adding all the values and dividing by the number of data items
        • Evaluation-most sensitive measure of central tendency as it takes into account exact distance between all values of data, but extreme score can give misleading impression of central tendency
      • Median
        • middle value in an ordered list
        • Evaluation-not affected by extreme score, it is misleading when the scores are clustered in low and high groups
      • Mode
        • most common value in a set of data.
        • Evaluation-it is not a useful way of describing data when there are several modes
    • Measures of Dispersion
      • Range
        • distance between the top and bottom values in a set of data
        • Evaluation-easy to calculate, affected by extreme values
      • Standard Deviation
        • asses the spread of data around the mean
        • Evaluation-more precise measure of dispersion because all values are taken into account, may hide some characteristics of the data set


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