whitearea dataset

Comparison of mixing processes

The percentage of white area in a sample of a dark product is used to evaluate how well a white raw material has been mixed into the product. Data are obtained from two processes. 1.1

data

Format

A data frame with 48 observations on the following 2 variables.

• process: a factor with levels A B
• whitearea: a numeric vector

Examples

str(whitearea)
qqmath(~ whitearea, whitearea, groups = process, aspect = 1,
       auto.key = list(space = "right", title = "Process"),
       xlab = "Standard normal quantiles",
       ylab = "White area")
t.test(whitearea ~ process, whitearea)