A(n) experiment guards against experimenters' tendency to prejudge results by eliminating the possibility of either the researcher or the subjects knowing which group is the control and which group is the experimental.

answer; /// i believe that the correct answer is that it lets you see and evaluate different formats as you develop your workbook;

answer; a serious and pervasive issue for many people;

george bush's second presidential term from 2005-2009 began with hurricane katrina devastating the gulf coast region of the united states in august 2005, causing approximately 1,800 deaths and billions of dollars in damages.

the correct answer is: hurricane katrina.