Displayed graphically where x-axis (or z-axis) = measured variable and y-axis = frequency
Central limit theorem - natural populaions should follow normal distribution around mean
Normal distributions important - determine which measure of central tendency (mean/mode/mediain) to use and measure of variability to use
Determine further choices of statistical analysis - parametric or non-parametric
Calcaulate mean and SD from z-axis
Normally distributed sample = >70% data falls around mean = low variability
ALWAYS TEST NORMALITY FIRST BEFORE OTHER TESTS
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