STAT 111 Introductory Statistics. Lecture 2: Distributions and Relationships May 19, 2004. Today’s Topics. Density curves The normal distribution Relationships between variables Correlation Scatterplots Regression (if time permits).
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Lecture 2: Distributions and Relationships
May 19, 2004
µ is the mean
σis the standard deviation
has the standard normal distribution.
Positive linear relationship
Negative linear relationship
Negative nonlinear relationship
Nonlinear (concave) relationship
This is a weak linear relationship.A non linear relationship seems to
fit the data better.
Analyze → Fit Y by X → Put the response variable into Y, explanatory variable into X → Hit OK → Double-click the red triangle above the scatterplot → Fit line
math = 498.00765 + 0.3167866 verbal
498.00765 + 0.3167866 (550) = 672
verbal = 408.37653 + 0.3901289 math
408.37653 + 0.3901289 (670) = 670