Given below are wing stroke frequencies4 for samples of

Chapter 15, Problem 27E

(choose chapter or problem)

Given below are wing stroke frequencies4 for samples of two species of Euglossine bees. Four

bees of the species Euglossa mandibularis Friese and six of the species Euglossa imperialis

Cockerell are shown in the accompanying table.

a Do the data present sufficient evidence to indicate that the distributions of wing stroke

frequencies differ for the two species? Use the test based on the Mann–Whitney U statistic

with α as close to, but not exceeding, .10.

b Give the approximate p-value associated with the test.