School

University of Guelph
Department

Statistics

Course Code

STAT 2230

Professor

Bill White

Lecture

11

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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