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What are Standard Scores? - PowerPoint PPT Presentation


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What are Standard Scores?. Standard scores provide a means to combine multiple scores with unlike scales?. Standard Scores . Two examples of standard scores: Z scores T scores. Variable. A variable is a measureable characteristic determined and defined by an experimenter. Z scores.

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standard scores
Standard Scores
  • Two examples of standard scores:
    • Z scores
    • T scores
variable
Variable
  • A variable is a measureable characteristic determined and defined by an experimenter
z scores
Z scores
  • Z scores represent standard deviation units on the normal curve
z score formulation
Z score formulation
  • High score is a good score

Z= X-X

s

Low score is a good score

Z= X-X

s

t score formulation
T score formulation
  • High Score is a good score

T = 10 (X-X)

s

  • Low score is a good score

T = 10 (X-X)

s

z scores and t scores represented on the normal curve
Z scores and T scores represented on the normal curve

Z score units

-3 -2 -1 0 1 2 3

T score units

20 30 40 50 60 70 80

benefits of z scores and t scores
Benefits of Z scores and T scores
  • Z scores and T scores are continuous scores and therefore can be added, subtracted, multiplied, and divided
  • These scores provide a means for combining scores that have unlike terms.