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lecture2_2slides - Statistics 528 Lecture 2 Section 1.1...

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Statistics 528 - Lecture 2 1 Statistics 528 - Lecture 2 1 Section 1.1 Displaying Distributions with Graphs Issue : How do we examine and describe the main features of a data set? We do exploratory data analysis . It involves examining each variable examining relationships between variables This is accomplished using graphs (today) numerical summaries (Friday) Statistics 528 - Lecture 2 2 Types of Graphs: Categorical Variables: 1) Bar Graphs 2) Pie Charts Quantitative Variables: 1) Histograms 2) Stemplots 3) Time Plots 4) Box Plots (Monday) 5) Dot Plots (Monday)

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Statistics 528 - Lecture 2 2 Statistics 528 - Lecture 2 3 Bar Charts Give percents or counts in different categories Example: Ethnicity of Statistics Students 0 10 20 30 40 50 60 Caucasian Asian African-American Percent Statistics 528 - Lecture 2 4 Pie Charts Give percentages in different categories Must include all categories that make up a whole Example: Ethnicity of Statistics Students Caucasian 40% Asian 50% African- American 6% Other 4%
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