A newspaper article says that on average, college freshmen spend 7.5 hrs a week partying. One administrator does not believe that these figures apply to her college of nearly 3000 freshmen. She takes a simple random sample of 100 freshmen and interviews them. On average, they report 6.6 hrs a week partying and the SD is 9 hours. Is the difference between 6.6 and 7.5 real?
The null says that the avg is________and the alternative says that the avg is _______
Is the difference real?