Answer
- When several means to compare 't'
tests are not valid.
- Analysis of variance
(ANOVA) is the appropriate method to determine if
one comparison is more comprehensive than other.
- It was developed by Ronald
Fisher.
- ANOVA determines whether there are
any statistically significant differences between the means of
three or more independent groups.
- There are two types of ANOVA
- one way ANOVA, the one factor or
independent variable analyzed has three or more categorical
groups.
Eg: Effect of three different
ethnicities on hypertension.
- Two way ANOVA compares multiple
groups of two factors
Eg: Compare job satisfaction of
staff nurses based on difference department ,age & gender.