The time needed for college students to complete a certain paper-and-pencil maze follows a Normal distribution, with a mean of 70 seconds and a...

The time needed for college students to complete a certain paper-and-pencil maze follows a Normal distribution, with a mean of 70 seconds and a standard deviation of 15 seconds. You wish to see if the mean time is changed by meditation, so you have a group of nine college students meditate for 30 minutes and then complete the maze. You compute the average of their times to complete the maze and will use this information to test the hypotheses