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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

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
• Can see patterns, trends, relationships, extraordinary values
Describing patterns
• Form-clusters, gaps, curved, linear, etc
• Direction(association)-positive or negative
• Unusual features-outliers, data far away from the rest

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

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
• Look for a pattern and deviations
• Describe the overall pattern briefly
The high temperature in degree Fahrenheit and coffee sales (in hundreds of dollars) for a coffee shop for eight randomly selected days.

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

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

Which scatterplot has

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

HW

P. 164 # 3, 5, 9, 11