Ch. 5 states z-scores

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Author:
mmb65
ID:
34975
Filename:
Ch. 5 states z-scores
Updated:
2010-09-15 18:34:27
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PSYC402
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ch.5 definitions
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  1. 2 useful purposes of z-scores
    • 1. each z-score tells the exact location of the original X value within the distribution
    • 2. z-score form a standardized distribution that can be directly compared to other distributions that also have been transformed into z-scores
  2. z-score
    specifies the precise location of each x value withing a distribution. Always includes a + or - sign
  3. z-scores to standardize a distribution: shape
    z-score shape will be the same as the original distribution of raw scores
  4. z-scores to standardize a distribution: The mean
    z-score distribution will always have a mean of 0
  5. z-scores to standardize a distribution: standard deviation
    distribution of z-scores will always have a standard deviation of 1
  6. standard deviation
    is composed of scores that have been transformed to create predetermined values for u and o. standardized distributions are used to make dissimilar distributions comparable
  7. procedure for standardizing a distribution to create new values for u and o (2 steps)
    • 1. the original raw scores are transformed into z-scores
    • 2. the z-scores are then transformed into new X values so that the specific u and o are attained
  8. standardizing a sample distribution
    • 1. the sample of z-scores will have the same shape as the original sample of scores
    • 2. the sample of z-scores will have a mean of 0
    • 3. the sample of z-scores will have a standard deviation of 1.

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