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MAT_1143-jan_28 - Now to Section 1.2 Describing...

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January 28, 2011 Now to Section 1.2 Describing Relationships between Two Variables
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Ways to Visualize Two-Variable Data Table Scatter Plots Equations (is actually one of our goals for ways to describe data) 60-second summary
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Table,Scatter Plot, and Equation Income Tithe 10 1 100 10 40 4 20 2 50 5 Obj102 T=.10*I Income 10 100 40 20 50 Tithe 1 10 4 2 5
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Horizontal Axis on a graph May be x May be time t (graph then called a time series) Could be another variable Depends on the problem Vertical Axis on a graph May be y Could be another variable Depends on the problem
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Increasing If vertical axis value gets larger as horizontal axis value gets larger Decreasing If vertical axis value gets smaller as horizontal axis value gets larger Tithe graph was increasing For our purposes both instances called growth (either positive or negative) We’ll get into the mathematical terminology in a few days Bible has many verses that talk about growth (there the meaning is POSITIVE growth)
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