NUMBAT OER - Open Educational Resources

There is a difference between the time ewes spent grazing when they did not have a lamb compared to the time they spent grazing when they did have a lamb (Figure 1) (Wilcoxon signed-rank test: T = 29, df = 16, P < 0.05)

Since this is a nonparametric test, an box plot is an appropriate presentation of the data.

Example box plot
Figure 1. Time spent grazing by bighorn ewes with and without lambs
(Source: Ruckstuhl, KE and Festa-Bianchet, M (1998) Do reproductive status and lamb gender affect the foraging behaviour of bighorn ewes? Ethology 104 941-54.)