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# Scatterplots - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Scatterplots' - ekram

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### Scatterplots

AP Statistics

CH. 7

EQ: How do we graph bivariate data?

• 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

• 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 and response variables.

• 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.

Book (in hundreds of dollars) for a coffee shop for eight randomly selected days.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

p.164 #2 (in hundreds of dollars) for a coffee shop for eight randomly selected days.

Book (in hundreds of dollars) for a coffee shop for eight randomly selected days.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 (in hundreds of dollars) for a coffee shop for eight randomly selected days.

P. 164 # 3, 5, 9, 11