PSYC 3250 Lecture Notes - Lecture 5: Percentile Rank, Percentile

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Psychological
Measurement
January 22, 2016
Percentiles
The percentile rank equals the portion of the group that rank equal to
or lower than you
Using Z-scores when the distribution is normal
Percentile ranks can be calculated with respect to the test sample or a
normative sample
Divide the population into 100 equal parts
Useful for giving the relative standing of an individual compared to
others
Empirical Rule
Z-score table
oMean to z – what proportion of the graph goes from mean to z (0
– z)
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