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Lecture 11

# STAT 2230 Lecture 11: Anova

3 Pages
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Department
Statistics
Course Code
STAT 2230
Professor
Bill White

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For comparisons of more than two variables
â€¢
Ha always has to be that there is difference between one of the
three variables, not specific way
â€¢
Can't use confidence intervals or t tests to accurately compare
multiple population means
â€¢
Alternative hypothesis now just states that the population means are
not equal
â€¢
Testing the alternative hypothesis that they are not all the same to
disprove the null hypothesis that they are is the F test
â€¢
Analysis of variance F test usually carried out with a test statistic, P
value and computer software
â€¢
F test does not indicate which of the means are different, but just
that they are or not
â€¢
Estimate sigma by rooting the mean square in residuals row
Anova
December 7, 2015
10:30 AM
Anova Page 1

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Anova December 7, 201510:30 AM For comparisons of more than two variables Ha always has to be that there is difference between one of the three variables, not specific way Cant use confidence intervals or t tests to accurately compare multiple population means Alternative hypothesis now just states that the population means are not equal Testing the alternativ
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