Felipe is curious if there is a relationship between a runner's age and their finishing time in a recent marathon. He takes a random sample of finishers and records the age (in years) and the finishing time (in minutes) for each of those sampled.
What type of statical test used in this case?
A. A paired t-test for the mean difference
B. A two-sample z-test for the difference of proportions
C. A t-test for slope
D. A two-sample t-test for the difference of means
E. A z-test for a proportion
