Data for Exercise 7.62

Darwin

## Format

A data frame/tibble with 15 observations on three variables

pot

number of pot

cross

height of plant (in inches) after a fixed period of time when cross-fertilized

self

height of plant (in inches) after a fixed period of time when self-fertilized

## Source

Darwin, C. (1876) The Effect of Cross- and Self-Fertilization in the Vegetable Kingdom, 2nd edition, London.

## References

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

## Examples


differ <- Darwin$cross - Darwin$self
qqnorm(differ)
qqline(differ)

shapiro.test(differ)
#>
#> 	Shapiro-Wilk normality test
#>
#> data:  differ
#> W = 0.90079, p-value = 0.09785
#>
wilcox.test(Darwin$cross, Darwin$self, paired = TRUE)
#>
#> 	Wilcoxon signed rank test
#>
#> data:  Darwin$cross and Darwin$self
#> V = 96, p-value = 0.04126
#> alternative hypothesis: true location shift is not equal to 0
#>
rm(differ)