28. Computer Usage and Weight in Children. The National Center for Health Statistics conducted a survey of children 12–15 years old. Three random samples were taken, one sample of normal or underweight children, one sample of overweight children, and one sample of obese children. The surveys noted whether the children used a computer for more than two hours per day. The results are presented in the following table. Test whether the population proportions of children who use the computer for more than two hours per day are the same for the three weight statuses, using level of significance .

659