Child Psych

Category - Research & Stats

Z-scores are a type of standard score (scores based on the standard deviation of the sample). Why is it useful to transform raw scores into z-scores?
  1. To normalize distribution of a sample
  2. To determine population parameters
  3. Because they correspond to percentile ranks
  4. Because they can be used to calculate standard error of the mean
Explanation
Answer: C - Z-scores are useful because they correspond to percentile ranks and because they are relatively easy to calculate from raw scores. However, they only correspond to percentile ranks in normal distributions and can only be defined when population parameters are known.
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