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Scatterplots. AP Statistics CH . 7 EQ: How do we graph bivariate data?. Scatterplots. Help to observe relationships between two quantitative variables(we call this describing bivariate data) Should have title, labels, units

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scatterplots

Scatterplots

AP Statistics

CH. 7

EQ: How do we graph bivariate data?

scatterplots1
Scatterplots
  • Help to observe relationships between two quantitative variables(we call this describing bivariate data)
  • Should have title, labels, units
  • Can see patterns, trends, relationships, extraordinary values
describing patterns
Describing patterns
  • Form-clusters, gaps, curved, linear, etc
  • Strength-weak, strong, spread
  • Direction(association)-positive or negative
  • Unusual features-outliers, data far away from the rest
slide4

Response Variable (Dependent)

    • Measures an outcome of a study
    • In a scatterplot it goes on the y axis
  • Explanatory/Predictor Variable (Independent)

-Attempts to explain the observed outcome

-In a scatterplot it goes on the x axis

slide5

If there is a relationship, tell which is the explanatory and response variables.

  • The amount of time spent studying and the grade on the exam
  • The weight and height of a person.
  • The amount of yearly rainfall and the yield of a crop.
  • Maximum daily temperature and average monthly heating bills.
principles
Principles
  • Start with a graph
  • Look for a pattern and deviations
  • Add numerical descriptions
  • Describe the overall pattern briefly
slide7
The high temperature in degree Fahrenheit and coffee sales (in hundreds of dollars) for a coffee shop for eight randomly selected days.
slide8

Tell which variable is explanatory and which is response.

  • Graph the scatterplot. Describe it.

C. Explain in a sentence what this says about high temperatures and coffee sales.

book p 164 2
Book P. 164 # 2

Suppose you want to collect data for each pair of

variables. You want to make a scatterplot. Which

variable would be the explanatory variable and which

would be the response variable? Discuss the likely

direction, form, and strength.

A. T-shirts at a store: price each, number sold

  • Skin diving: depth, water pressure
  • Skin diving: depth, visibility
  • All elementary-school students: weight, score on a reading test
book p 164 6
Book P. 164 # 6

Which scatterplot has

  • Little or no association
  • A negative association
  • A linear association
  • A moderately strong association
  • A very strong association
slide17

HW

P. 164 # 3, 5, 9, 11

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