Question

3. In Problem #5 of the first homework assignment, you computed some summary statistics for PCB concentrations in soils in the United Kingdom. Use those data to create separate box-and-whisker plots for the rural and urban data. Draw them on the same page, using the same scale. Does your analysis support the conclusion that there is a significant difference between PCB concentrations in rural and urban areas?

Problem 3. PCB Concentration in UK soils
		Rural	Urban	Rank
		1.0	11	1
		1.5	11	2
		1.6	12	3
		1.8	13	4
		3.5	16	5
		5.3	18	6
		8.1	18	7
		8.2	21	8
		9.0	22	9
		9.7	24	10
		9.8	29	11
		12.0	49	12
		15.0	94	13
		23.0	107	14
			141	15
	Median	8.2	21.0
	Lower Quartile	2.7	14.5
	Upper Quartile	9.8	39

Answer 1