diameter dataset

Diameter of product

The diameter of tracking balls for computer mice from two different production lines. The nominal diameter of the ball is 2 cm. 1.1

data

Format

A data frame with 20 observations on the following 2 variables.

• line: a factor with levels A B
• diameter: diameter of the tracking ball (cm.)

References

Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)

Examples

str(diameter)
dotplot(line ~ diameter, diameter, type = c("p","a"),
        jitter.y = TRUE, aspect = 0.2, ylab = "Line",
        xlab = "Diameter of tracking ball (cm.)")
bwplot(line ~ diameter, diameter, type = c("p","a"),
       jitter.y = TRUE, aspect = 0.2, ylab = "Line",
       xlab = "Diameter of tracking ball (cm.)")