PSY201H1 Chapter Notes - Chapter 4: Standard Deviation, Squared Deviations From The Mean, Central Tendency
17 Oct 2012
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The sum of the scores divided by the number of scores. Sensitive to the exact value of all the scores in the distribution. The sum of the deviation about the mean equals zero, or (xi- The sum of the squared deviations of all of the scores about their mean is a minimum, or (xi- Of the measures used for central tendency, the mean varies the least subject to sampling variation in most cases. To multiply many means of different samples: overall = The scale value below of which 50% of the scores fall. Therefore, it is the same thing as p50. Less sensitive than the mean to extreme scores, but more subject to sampling variability than the mean but less than the mode (in most cases) The most frequent score in the distribution. The distance between the highest and lowest scores in the distribution. Range = highest score lowest score.
