These data involve 11 laboratories and 2 brands of chalk. The laboratories tested the density of the chalk. The main interest was whether the different laboratories yielded the same density for the two different types of chalk.
这些数据涉及11个实验室和2个品牌的粉笔。实验室测试粉笔的密度。主要关心的是,不同的实验室是否产生了相同的密度为两个不同的类型的粉笔。
用法----------Usage----------
data (chalk.df)
格式----------Format----------
A data frame with 66 observations on 3 variables.
有66个观察3个变量的数据框。