Abstract:
The purpose of this study is to compare mental ability and mathematical achievement between the symbolic logic learning student and non learning one when some topics of symbolic logic is taught at the Prathom Suksa Seven. The researcher took sample of eighty four Prathom Suksa Seven students (forty two boys and forty two girls) from Wathong-rattanaram School, The sample was devided into experimental and control groups with following hypothesis 1. Prathom Suksa Seven students could learn the symbolic logic. 2. The students who learned the symbolic logic had higher mental ability than non learned students. 3. The students who learned the symbolic logic had higher mathematical achievement than non learned students. Before the experiment, Jirapans mental ability and mathematical. achievement tests were given to both experimental and control groups. The researcher, then taught mathematics according to Minis¬try of Education Curriculum one hour each day for eight weeks (40 hours) to the control group. However, he taught the same subject for twenty four hours; and forther rest of sixteen hours symbolic logic such as the meaning of true and false, propositions, connections . (not, and, or, if...then...,and...if and only if...) open sentences and qualifiers, deduction and Venn Diagram was taught to the experi¬mental group. When the teaching was completed, the researcher gave three types of tests I the symbolic logic test, Jirapan's mental ability test and mathematical achievement test to both experimental and control groups. The outcome of this test was compared against the previous one to analyze the deviation by method of two by two factorial analysis of covarience. The findings are as follows: 1. The Prathom Suksa Seven students could learn the symbolic logic. 2. The students who learned the symbolic logic had higher mental ability than the non learned students at the 0.01 level of significance. 3. There was no significant difference in mathematical achievement between the experimental and control groups. 4. There was no significant difference in mental ability and mathematical achievement between boys and girls.