6.81 Academic probation and TV watching.

There are other statistics that we have not yet met. We can use Table D to assess the significance of any statistic. A study compares the habits of students who are on academic probation with students whose grades are satisfactory. One variable measured is the hours spent watching television last week. The null hypothesis is “no difference” between the means for the two populations. The alternative hypothesis is two-sided. The value of the test statistic is .