Residual contaminant following the use of three different cleansing agents

Source: R/BSDA-package.R

Data for Exercise 10.16

Clean

Format

A data frame/tibble with 45 observations on two variables

clean

residual contaminants

agent

a factor with levels A, B, and C

References

Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.

Examples


boxplot(clean ~ agent, col = c("red", "blue", "green"), data = Clean)

anova(lm(clean ~ agent, data = Clean))
#> Analysis of Variance Table
#> 
#> Response: clean
#>           Df  Sum Sq Mean Sq F value    Pr(>F)    
#> agent      2 108.133  54.067   47.44 1.679e-11 ***
#> Residuals 42  47.867   1.140                      
#> ---
#> Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1