Mean: xbar = E(fx) / N , most widely used measure of central tendency, Also known as the "average" , Median: (N+1) / 2 , represents the exact middle of a distribution, it divides the distribution into two equal parts so that half the observations are above it and half below it, it is the 50th percentile , Mode : occurs most often, the category or score with the highest frequency (or percentage) in the distribution, always a category or score, can be bimodal or multimodal , Levels of Measurements : Nominal, Ordinal , Interval-Ratio ,

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