# Lecture02 - STAT 350: LECTURE 2 TOPICS 1.2: Visual Display...

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STAT 350: LECTURE 2

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TOPICS 1.2: Visual Display for Univariate Data Histograms 1.3: Describing Distributions Density Functions
HISTOGRAM Ratings of a book from 30 readers

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DESCRIPTIVE STATISTICS: GRAPHICAL Graphical display: informative and clear Numerical measures: Provides a quantitative measure Example: Mean, Median center of the data Standard deviation -- spread of the data
HISTOGRAMS FOR DISCRETE DATA Construction: Count the occurrence of each value of the variable Plot the counts (frequency) on the vertical axis Can display as frequencies (counts) or relative frequencies (percents)

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ISTOGRAM FOR CONTINUOUS DATA Construction: Subdivide the x-axis into a number of class intervals Equal class width or unequal class width Plot the relative frequency for each class Height = relative frequency of the class / class width Q: How to find the relative frequency of a class? The class size influences how the histogram looks
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## This note was uploaded on 02/06/2012 for the course STAT 350 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Lecture02 - STAT 350: LECTURE 2 TOPICS 1.2: Visual Display...

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