The article “Analyses of Phenotypic Differentiations among South Georgian Diving Petrel Populations Reveal an Undescribed and Highly Endangered Species from New Zealand” (PLoS ONE, June 27, 2018) reports the possible discovery of a new species of P. georgicus, distinct from the birds of the same name found in the South Atlantic and South Indian Oceans. The table below summarizes information on the bill length (mm) of birds sampled for the study; bill length distributions are skewed, so a nonparametric method is appropriate.

Test at the .01 significance level to see whether the mean bird length differs across these three geographic groups of P. georgicus. The researchers performed over a dozen similar tests and found many features in which the New Zealand petrels are starkly different from the others.

Transcribed Image Text:

Bird origin S. Adantic S. Indian New Zealand J₁ 22 38 126 121.0 109.3 83.9