Question

A researcher conducts a study, and as part of the study, measures the height and weight of patients that she has split into two study groups. The data below represents the height and weight of 20 patients split into two groups enrolled in a study. Use this data to answer question 7.

GROUP 1	Patient ID	A	B	C	D	E	F	G	H	I	J
	Height	67	70	67	70	63	69	66	65	65	63
	Weight	163	168	147	161	136	150	153	148	146	135
GROUP 2	Patient ID	K	L	M	N	O	P	Q	R	S	T
	Height	67	66	63	71	61	69	63	69	66	60
	Weight	177	171	171	169	161	177	174	168	165	157

1. Plot the data on a single scatterplot, keeping height on the horizontal access. Be sure to differentiate patients in the two groups (for example, with different colors).

Answer 1

I have used R to construct the scatterplot. You can find the R code and the scatterplot below:

x1=c(67,70,67,70,63,69,66,65,65,63)
x2=c(67,66,63,71,61,69,63,69,66,60)
y1=c(163,168,147,161,136,150,153,148,146,135)
y2=c(177,171,171,169,161,177,174,168,165,157)
plot(x1,y1,lty=2,col=2,pch=15,xlim=c(60,75),ylim=c(125,185),xlab="Height",ylab="Weight",main="Scatterplot")
points(x2,y2,lty=2,col=3,pch=16)
legend("bottomright",col=c(2,3),c("Group 1","Group 2"),pch=c(15,16))