STT 201 Study Guide - Midterm Guide: Central Limit Theorem, John Tukey, Scatter Plot
16 Feb 2013
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Document Summary
Numerical: measurement: discrete: counted exactly, continuous: has a range. Asymmetric data: histogram, boxplot/stem-and-leaf plot, scatter plot. Properties: above x-axis, total area under = 1, area between (a, b) = proportion of data between (a, b) Shape: unimodal: 1 peak, bimodal: 2 peaks, trimodal: 3 peaks, symmetric: no peaks. Skew: positive: more data on the right side, negative: more data on the left side. Boxplots: graphical display of the five point summary (can also be done with a stem-and-leaf plot) Five point summary (divided into equal fourths: minimum: lowest value, lower quartile (q1), medan (q2), upper quartile (q3), maximum: highest value. Inner quartile range (iqr): left side, right side: Correlation: how to measure the magnitude of linear association. Regression: how to predict y from x. Least squares method: use exploratory analysis by looking at the scatter plot, make a judgment based on the error in prediction, where. The point will always pass through this line.
