River City Is Seeking to Compare the Effects of Two

Essay

River City is seeking to compare the effects of two mosquito sprays, A and B, to beused in the insect control plan for their park system. Consider the following twoplans for a statistical study:• In Plan #1, a simple random sample of plots of park land would be taken from thepopulation of River City parks. Either treatment A or B would be randomlyassigned to each of the plots.• In Plan #2, a simple random sample of plots of park land would be taken from thepopulation of River City park areas that are rarely visited. Either treatment A orB would be randomly assigned to each of the plots.
a) Consider study plan #1:i) Would it be appropriate to infer a cause-and-effect relationship if the results ofthe two treatments differ?
Why or why not?
ii) Could the results be generalized to all areas of the park land?
Why or whynot?
b) Consider study plan #2:i) Would it be appropriate to infer a cause-and-effect relationship if the results ofthe two treatments differ?
Why or why not?
ii) Could the results be generalized to all areas of the park land?
Why or whynot?