Scatter Plots

1
Scatter Plots

• How do I make a scatter plot?

2
Table of Contents

• Coordinate Plane background
• What is a scatter plot?
• How do I interpret a scatter plot?
• How do I create one on paper?
• How do I create one with a graphing calculator?

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Coordinate Planes explored

• Formed by 2 real number lines that intersect at a
  right angle.
• X-axis horizontal axis
• y-axis vertical axis
• Ordered pairs
• identify points on the coordinate plane.
• (x, y)

Origin (0,0)
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What is a scatter plot?
Study Time Grades

• Collection of ordered pairs
• Shows relationship between 2 different sets of
  data
• Shows what kind of relationship exists between
  the data

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3 Types of Correlation

• Positive - as one value goes up, the other goes
  up

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3 Types of Correlation

• Negative - as one value goes up, the other goes
  down

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3 Types of Correlation

• No correlation - as one value goes up, the other
  neither goes up or down

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Create one on Paper

• Make grid on graph paper
• Label axes with data categories
• Label intervals to fit data
• Plot ordered pairs
• Draw Line of best fit
• Title

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Your Turn

• Complete Temperature and Latitude scatter plot on
  page 162

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Create on Graphing Calculator

• Turn STAT PLOT on (2nd Y)
• Set WINDOW to fit data x and y values
• Use multiples of 5 or 10 as you would on graph
  paper
• Insert data into LIST1 LIST2 (from STAT menu gt
  EDIT)
• You need the same number of items in each list!
• Graph

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Your Turn

• Complete Archery Sales scatter plot on page 162
  with graphing calculator.
• Show me your graph
• Page 164, 19
• Homework Page 164 165, 20 - 26