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
#>