H0: The THC concentration in the blood is indepenent on the amount of cannabis smoked.
THC<-read_excel("09_data.xlsx", sheet="A")
summary(THC)
cor.test(THC$THC,THC$DW)
We reject the H0. There is a significant dependency between THC concentration in the blood and the
amount of cannabis smoked. The correlation is quite high.