November 2006
Beginner to intermediate
292 pages
7h 26m
English
book
Making Sense of Data: A Practical Guide to Exploratory Data Analysis and Data Mining
by Glenn J. Myatt
Content preview from Making Sense of Data: A Practical Guide to Exploratory Data Analysis and Data Mining
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5.5 SUMMARY
Central Tendency
Mode: Most common value
Median: Middle value
Variation
Range: high–low
Quartiles: Q1 (25%), Q2 (50%), Q3 (75%)
Confidence Levels
Hypothesis Test
Specify null (e.g. H0: μ = μ0) and alternative hypothesis (e.g. Ha: μ > μ0)
Select significance level (e.g. α = 0.05)
Compute test statistics (t- or z-)
Determine critical value for t or z using α/2 for two sided tests
Reject the null hypothesis if test statistic fall in the “reject H0” region
Comparing Groups
When comparing more than two groups, use:
Chi-square test for categorical data
One-way analysis of variance test for continuous.
Comparing Variables
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