(In some of the exercises that follow, we must make assumptions such as the existence of normal distributions with equal variances.)
An ecology laboratory studied tree dispersion patterns for the sugar maple, whose seeds are dispersed by the wind, and the American beech, whose seeds are dispersed by mammals. In a plot of area 50 m by 50 m, they measured distances between like trees, yielding the following distances in meters for 19 American beech trees and 19 sugar maple trees:
(a) Test the null hypothesis that the means are equal against the one-sided alternative that the mean for the distances between beech trees is greater than that between maple trees.
(b) Construct two box plots to confirm your answer.
Chapter 14 Thursday, April 28, 204:40 PM The Media as a Political Institution Tuesday, April 19, 2016 10:47 AM • Although not a formal branch of the U.S. government, the media play a critical institutional role in the political system • It is impossible to maintain a democratic political system over time without a properly functioning media The Media as a Political Institution: Diversity Tuesday, April 19, 2016 10:50 AM • A diversity of sources, firms, and technologies makes up the media ○ 1,400 daily newsp