Question

Find two numeric variables with a realatioship?

Answer 1

Sol:

let the data be

productionvolume   totalcost
400   4000
450   5000
550   5400
600   5900
700   6400
750   7000

production volume,x

total cost,y

Plot a scatteplot in R

df1 =read.table(header = TRUE, text ="
productionvolume   totalcost
400   4000
450   5000
550   5400
600   5900
700   6400
750   7000

"
)
df1

plot(totalcost ~ productionvolume,data=df1,pch=16)

output:

to get the correlation coeffcient in R type

cor(df1$productionvolume,df1$totalcost)

0.9791271

r=0.9791271

there exists a strong positive relationship between production volume and total cost .

Form:linear

strength:strong

Direction:positive