lecture13 - Psych 100A Winter 2010 Lecture Lecture 13:...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Psych 100A Winter 2010 ecture 3: Correlation and Re ression Lecture 13: Correlation and Regression ntroduction Introduction • Linear Correlation egression • Regression Simple Linear Regression odel/Formulas Model/Formulas • Applications Real-life Applications Practice Problems • Internet Resources 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
orrelation Correlation orrelation Correlation – A measure of association between two umerical variables numerical variables. Example (positive correlation) ypically in the summer as the – Typically, in the summer as the temperature increases people are irstier thirstier. 2
Background image of page 2
Specific Example Temperature Water Consumption For seven random summer (F) (ounces) 75 16 days, a person recorded the mperature nd 83 20 85 25 temperature and their water onsumption 85 27 2 2 consumption , during a three- our period spent 92 32 97 48 hour period spent outside. 99 48 3
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
How would you describe the graph? 4
Background image of page 4
How “strong” is the linear relationship? 5
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Measuring the Relationship Pearson’s Sample orrelation Coefficient Correlation Coefficient, r measures the direction and the strength of the linear association between two numerical paired variables. 6
Background image of page 6
Direction of Association Positive Correlation Negative Correlation 7
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
trength of Linear Association Strength of Linear Association r value Interpretation perfect positive linear 1 relationship 0 no linear relationship -1 perfect negative linear elationship relationship 8
Background image of page 8
trength of Linear Association Strength of Linear Association 9
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ther Strengths of Association Other Strengths of Association r value Interpretation 0.9 strong association 0.5 moderate association 0.25 weak association 10
Background image of page 10
ther Strengths of Association Other Strengths of Association 11
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Formula = the sum number of paired
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 37

lecture13 - Psych 100A Winter 2010 Lecture Lecture 13:...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online