## Source

*Consumer's Guide to Hospitalization Charges in North Carolina Hospitals*
(August 1994), North Carolina Medical Database Commission, Department of Insurance.

## References

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

## Examples

```
boxplot(cost ~ region, data = Appendec, col = c("red", "blue", "cyan"))
anova(lm(cost ~ region, data = Appendec))
#> Analysis of Variance Table
#>
#> Response: cost
#> Df Sum Sq Mean Sq F value Pr(>F)
#> region 2 545154 272577 0.2327 0.7931
#> Residuals 56 65593438 1171311
```