STA 100 Study Guide - Midterm Guide: Box Plot, Test Statistic, Memory Stick
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Continuous: a numeric variable which can take on an infinite amount of values within an interval. Discrete: a numeric variable which has natural gaps. Ordinal: categorical data which has a natural rank or order. Nominal: categories which have no natural rank or order. *random variable is denoted as y or yi. Observed value of the random variable is denoted y or yi. If need be, round the value up or down, and average the data in those ordered positions. *deviations from the mean (distance yi is from the mean): *standard deviation ( the typical deviation of y from its mean ): Q1 = 1st quartile and the 25th percentile. Q2 = 2nd quartile, the 50th percentile, and the median. Q3 = 3rd quartile and the 75th percentile. The standard deviation is ___% of the mean . Frequency interpretation (# of times a occurred/total. All events equally likely (# of outcomes of a/total # of outcomes)
