argu28

28.The following is a memo from the superintendent of the Mylar school
district.

"A recent six-month study, in which breakfast was made available at school
for 100 schoolchildren ages five to twelve, found that children on the
breakfast plan were less likely than other children to be absent from or
late for school. Clearly, eating breakfast before school plays a role in
reducing student absenteeism and tardiness. It is also well known that
children who regularly eat a healthful breakfast tend to perform better in
school. Therefore, in order to reduce absenteeism and tardiness and to
improve academic performance in all of Mylar's elementary and secondary
schools, we should provide breakfasts for all students before each school
day."

1.能够起来吃早餐的学生，基本不可能迟到。换句话说，吃早餐和迟到并没有因果关系。也有可能这些学生平时就有良好的习惯。

2.文中没有明确的证据来证明吃健康早餐的学生表现更好。

3.作者的调查对象是5-12岁的学生，而结论中是说所有的小学和初中生。作者提到健康早餐能够使得学生表现更好，而结论中则只是说提供早餐，不一定是健康的早餐。

4.调查没有代表性，100个只是绝对数量