A researcher wants to test whether a certain sound will make rats do worse on Learning tasks. It is known that an ordinary rat can learn to run a particular maze
Correctly in 18 trials, with a standard deviation of 6. (The number of trials to
Learn this maze is normally distributed.) The researcher now tries an ordinary rat
In the maze, but with the sound. The rat takes 38 trials to learn the maze.
Using the .05 level, what should the researcher conclude? Solve this problem
Explicitly using all five steps of hypothesis testing, and illustrate your answer
With a sketch showing the comparison distribution, the cutoff (or cutoffs), and
The score of the sample on this distribution