Dr. Jones has created a new drug that she believes raises intelligence.To test the drug's effect, she randomly selects 15 rats and tests their learning ability in a maze after they have been injected with the drug. Prior studies indicated that the mean time to complete the maze is 90 seconds. The times to complete the maze for Dr. Jones's subjects are: 95, 84, 80, 92, 90, 75, 100, 88, 94, 82, 78, 94, 86, 85, 83.What can Dr. Jones conclude? Use a one-tailed test at the .05 significance level.