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redo outline - Chapter 6 Scaled Scores and Standard Scores...

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Chapter 6 – Scaled Scores and Standard Scores I. Scaled scores a. Scores that are adjusted via some type of scaled through applying (addition, subtraction, multiplication, division) the same constant to all the scores in the distribution. b. When raw scores are transformed into scaled scores, the distribution is invariably modified in some way where the mean, variance, and/or standard deviation may change. i. Adding or subtracting a constant: No change in Variability 1. If you add or subtract a constant from each score in the distribution, the mean changes by the amount that is added or subtracted, and variance and standard deviation remain the same. new mean = original mean +/- constant S (new) = S(original) 2. Adding a constant to each score will increase the value of each score, the sum of the scores, and the mean, but does not effect the spread of the scores. 3. EX: Dr. Ardtest’s exam results were 45 points lower than the typical mean, so she added 45 points to each score to make up the difference.

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