A new training technique is supposed to decrease how long it takes professional sprinters to run 200-meter races (i.e. this training technique will increase their speed). A trainer takes a random sample of female sprinters and records how long it takes sprinters to run 200 meters after the training. The trainer finds that the average time it takes the population of female sprinters to run 200 meters is 22.965 seconds with standard deviation 0.360. µ = 22.965 σ = 0.360 The trainer's sample completed the sprint in 22.793 seconds (n = 16). What is the z-score of this sample mean?