Thicknesses of 1872 Hidalgo stamps issued in Mexico
Data for Statistical Insight Chapter 1 and Exercise 5.110
Stamp
A data frame/tibble with 485 observations on one variable
stamp thickness (in mm)
Izenman, A., Sommer, C. (1988), Philatelic Mixtures and Multimodal Densities, Journal of the American Statistical Association, 83, 941-953.
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
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)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.