Use the following information for questions:
A student doing an internship at a large research firm collected the following data, representing all of the studies the firm had conducted over the past 3 years.
-Define the events E = {the study was an experiment}, U = {the study used randomization} and R = {the study was a retrospective observational study}. Which of the following sets of events are disjoint?
A) E and U
B) E and R
C) U and R
D) All three
E) None of the above

Question

Use the following information for questions:
 A student doing an internship at a large research firm collected the following data, representing all of the studies the firm had conducted over the past 3 years. 
-Define the events E = {the study was an experiment}, U = {the study used randomization} and R = {the study was a retrospective observational study}. Which of the following sets of events are disjoint?
A) E and U 
B) E and R 
C) U and R 
D) All three 
E) None of the above

Quizplus · Accepted Answer

E and R are disjoint because an experiment (E) involves manipulating variables to determine effects, while a retrospective observational study (R) involves looking back at data without manipulation of variables.

Use the Following Information for Questions