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Standardising scores into a z score is a ___ transformation
linear
Transforming z scores into a percentile rank is a ___ transformation
non-linear
If someone scores between ±/- 1 SD of the mean on a test, what percentage and fraction of the population are they the same as?
68% or middle two-thirds
If someone scores between ±/- 2 SD of the mean on a test, what percentage and fraction of the population are they the same as?
95%