繼續研讀 Applied Statistics for The Behavioral Sciences

• 複習 Standard Scores
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• The z score indicates the number of standard deviations a corresponding raw score is above or below the mean.
• A distribution of z score (1) retains the shape of the distribution of the original scores, (2) has a mean of 0, and (3) has a variance and standard deviation of 1.
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• When developing a composite score from two or more individual scores, first transform the individual scores into standard scores. Then apply the weights to generate the weighted score.
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• =new or transformed score for a particular individual
• =desired standard deviation of the distribution
• =standard score for a particular individual
• =desired mean of the distribution
• To transform a distribution of scores into a distribution with a desired mean and standard deviation, multiply the z scores by the desired standard deviation and add the desired mean.