Two years ago, a complete survey of all students in a large university indicated that the mean number of cigarettes smoked per day by male students was 8.3 with a standard deviation of 3.7. The director of student health services wishes to determine whether or not smoking habits among male students at the university have changed over the 2-year period. She obtains the following results form the men from a recently selected random sample of students (in cigarettes smoked per day): x bar=7.7, n=108. (a) Set up Ho and Ha (b) Perform the statistical test (a=.05) (c) draw final conclusions
