Thicknesses of 1872 Hidalgo stamps issued in Mexico

Source: R/BSDA-package.R

Data for Statistical Insight Chapter 1 and Exercise 5.110

Stamp

Format

A data frame/tibble with 485 observations on one variable

thickness

stamp thickness (in mm)

Source

Izenman, A., Sommer, C. (1988), Philatelic Mixtures and Multimodal Densities, Journal of the American Statistical Association, 83, 941-953.

References

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

Examples


hist(Stamp$thickness, freq = FALSE, col = "lightblue", 
     main = "", xlab = "stamp thickness (mm)")
lines(density(Stamp$thickness), col = "blue")

t.test(Stamp$thickness, conf.level = 0.99)
#> 
#> 	One Sample t-test
#> 
#> data:  Stamp$thickness
#> t = 126.6, df = 484, p-value < 2.2e-16
#> alternative hypothesis: true mean is not equal to 0
#> 99 percent confidence interval:
#>  0.08426759 0.08778189
#> sample estimates:
#>  mean of x 
#> 0.08602474 
#>