1.62 A Malaysian swimming coach wanted to see if working with a sports psychologist would improve the performance of elite swimmers. A random sample of 12 swimmers took part in the year-long program. The following ordered pairs show the number of sessions each swimmer had with the psychologist and the corresponding improvement in their personal best times (in seconds) for the 800-meter freestyle.
19, 2.42, 120, 5.62, 16, 1.82, 112, 4.12, 19, 2.12, 115, 4.82, 17, 2.32, 19, 4.32, 118, 6.22, 124, 7.12, 19, 1.52, 16, 2.22 Plot the data and state whether you think the program has been successful.