<u>(a) Construct a 95% confidence interval for the difference between the average number of intrusion attempts per day before and after the change of firewall setting (assume equal variance)</u>
The top right is the answer. The base should be square with lengths of 8 and the height is 10.
It is a good idea to check to see if your answer is reasonable because a. if your answer is reasonable, you have probably done the problem correctly.
I think you do 120 divided by 5, but I could be wrong.