Class Size and Academic Performance of Senior Secondary School Students in Mensuration in Ogbomoso Education Zone, Nigeria

This study investigated the influence of class size on the students’ performance in mensuration in Ogbomoso Education Zone, Oyo State, Nigeria. The design of the study was ex-post-facto design. The target population in the geographical scope of this study is thirty- one thousand seven hundred and six (31,706) SS II students out of which a sample of two hundred and seventy four (274) students were selected using purposive sampling technique that form sample size for the study. Two research questions were asked to guide the study while two hypotheses were formulated and tested at 0.05 level of significance. Only one research instrument; Mathematics Performance Test on Mensuration (MPTM) was developed, validated by two experts in Mathematics Education and used to collect data for the study. The instrument yielded reliability coefficient of 0.85 using test retest method to ensure internal consistency of the instrument. Data collected were analysed using mean, standard deviation and t-test. Findings from the study revealed that there was a significant difference in the mean performance scores of students taught in large class size and in small class size. There is no significant difference in the mean performance scores of SS II students taught Mensuration in the rural and urban areas based on class size. Based on the findings, it was recommended, among others, that school principals and other stakeholders who are in charge of admission of students need to take into cognizance the resources available in the schools and the number of students to be given admission