5.55 ● The accompanying data represent x 5 amount of catalyst added to accelerate a chemical reaction and y 5 resulting reaction time:

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

a. Calculate r. Does the value of r suggest a strong linear relationship?

b. Construct a scatterplot. From the plot, does the word linear provide the most effective description of the relationship between x and y?

Explain.