5. A professor wants to know if informing students that an upcoming exam is very difficult will have a positive effect on grades (students study more because they know it will be more difficult) or a negative effect on grades (students do worse because they have anxiety since they know it will be more difficult. He is not sure so he wants to find out using hypothesis testing. He informed his class of 25 students that the upcoming test was going to be very difficult. The average grade from that class turned out to be 72. The professor checked his records from all the previous classes he had taught, and the population average for his students in that exam was 74 with a standard deviation of 6.12. (Do the 7 steps of hypothesis testing. You can show the rest of your work on the back of this assignment if needed)