The accompanying data represent x the amount of catalyst ad

The accompanying data represent x = the amount of catalyst added to accelerate a chemical reaction and y = the resulting reaction time.

(a) Calculate r. (Give the answer to three decimal places.)
r =

x	1	2	3	4	5
y	49	46	41	34	25

The correlation function using MS-EXCEL function CORREL gives the following value of r.

r = -0.981