A random sample of 16 students chosen from the student body of large university had average age of 25 years. We want to find out if the average age of all the students at the university is significantly different from 24. Suppose the distribution of the population of ages is normal with a standard deviation of 2 years.
At a .05 level of significance, it can be concluded that the mean age is
not significantly different from 24
significantly different from 24
significantly less than 24
significantly less than 25