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Psyc 305
Week 7
Regression
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At the end of these two classes you should:
•
Understand the relationships between z scores, correlation,
and regression.
•
Understand how regression allows us to make predictions.
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Understand how we select a regression line.
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Be able to compute a regression equation from raw scores or
zscores.
•
Understand the principle of “regression to the mean”.
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Understand and compute the error in the predictions.
•
Understand what multiple correlation is and when it should be
used.
Descriptive Statistics
(simplify, summarize, and organize data)
1. frequency distributions
2. graphical representations of data
3. summary statistics
a. measures of central tendency
b. measures of variability
c. measures of relationship (2 + variables)
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View Full Document Where we’ve been and where we
are going.
..
X  one variable
Y  one variable
Mean
SD
Mean
SD
A stroll down memory lane.
..
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Y
0
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X
You are in 8th/9th grade
algebra and your teacher says
to you…
If Johnny works 2 hours he’ll
have $2 but if he works 6
hours he’ll have $4. (He gets
paid the same for each hour of
work.)
Draw a line showing the
relationship between hours
worked and money he has.
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..
I am interested in the relationship between
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This note was uploaded on 09/25/2008 for the course PSYCH 305 taught by Professor Freeman during the Fall '08 term at UVA.
 Fall '08
 FREEMAN

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