繼續研讀 Applied Statistics for The Behavioral Sciences

• 12:40-14:10
• Measures of Variation
• Measures of variation are lengths of intevrals on the scale of measurement that indicate the variation, or spread, of scores in a distribution.
• Range
• The range is defined as the number of units on the scale of measurement that indicate the highest and lowest values.
• Box Plots
• Box plots can be used to provide a graphical summary of both the central tendency and variation of a distribution of scores.
• Outliers
• An outlier is defined as a unusual score in a distribution that may warrant special consideration.
• Other Measures of Variation
• Mean Deviation (離均值)
• The mean deviation is the average of the absolute values of the deviation scores.
• Variance (變異數)
• The variance is defined as the average of the sum of squared deviations around the mean.
• Standard Deviation (標準差)
• The standard deviation is the square root of the variance. It is expressed in the same units as the original measurement of the variable.