# STA 2000 Study Guide - Midterm Guide: Frequentist Probability, Central Limit Theorem, Simple Random Sample

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3 Sep 2018
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## Document Summary

Qualitative data (non-numerical) nominal : category (gender); ordinal : ordered (school year) Quantitative data (numerical) continuous : fractions (height, weight); discrete : whole # (# of kids) Reference data , indicator data , cross-sectional data, time-series data. Non-probabilistic convenience ( 1 location; 1 time), judgment , volunteer, snowball (recommend), quota. Probabilistic simple random sample (srs) (equal chance) 1)sample frame (phone book) 2)pseudo-random; systematic ( every kth value); Statistics : make sense of, describe, analyze variation to make better decisions. Descriptive statistics : describe and represent data; graphical or numerical. Graphical - frequency table, bar graph, pie chart, pareto diagram (decreasing bar graph) Numerical - measures of center (average, mean, median, mode, midrange, midquartile); measures of spread and position (range, quartiles (0-4 1st quart 1/4n decimal - round up. Iqr = q3 - q1 and siqr = iqr/2 (measure outlier) Graphical : freq. dist. , histogram, frequency polygon, stem & leaf, ogive (cum freq with s shape)