The study examined the reliability index of 2015 West Africa Examination Council Economics objective items. It determined the reliability coefficient of 3, 4 and 5 options using Kuder-Richardson Formula. Three objectives were raised and three research questions were used to guide the study. The study adopted survey design. The population of the study consisted of secondary school students in Osun State. The study sample consisted of 360 student?s selected using multistage sampling procedure. The instrument used for this study was an adapted version of the 2015 West Africa School Certificate Examination (WASCE) Economics test items. The 4-options WASCE Economics items were adopted while its 3- and 5-options items were adapted. Data collected were analysed using Kuder Richardson Formula (KR-20) and Fisher?s Z-Test with aid of FZT compotator. The results of the study showed that the reliability coefficient of 3-options items was 0.26; while the reliability index of 4-options item was 0.68 and 5-options had reliability coefficient of 0.62. This implies that 4-options Economics test items are more reliable than 3 and 5-options when number right scoring procedure were used. The study therefore concluded that four option items especially in multiple choice Economics tests should be encouraged but if five options items should be used more attention should be given to psychometric properties of the tests.

Economics