Data for Exercise 10.32

Heating

## Format

A data frame/tibble with 90 observations on the two variables

type

a factor with levels A, B, and C denoting the type of oil heater

efficiency

heater efficiency rating

## References

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

## Examples


boxplot(efficiency ~ type, data = Heating,
col = c("red", "blue", "green"))

kruskal.test(efficiency ~ type, data = Heating)
#>
#> 	Kruskal-Wallis rank sum test
#>
#> data:  efficiency by type
#> Kruskal-Wallis chi-squared = 6.264, df = 2, p-value = 0.04363
#>