Aresearcher 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. more trials mean worse performance on the task) the researcher now tries an ordinary rat in the maze, but with the sound. the rat takes 38 trials to learn the maze. (a) using the .05 level, what should the researcher conclude ? solve this problem explicitly using ll 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. (b)ten explain myour answer to someone who has never had a course in in statistics (but who is familiar with the mean, standard deviation, and z scores).