Investigation of National Business and Technical Examination Board (NABTEB) 2013 to 2015 Chemistry Multiple Choice Test Items’ Parameter Invariance (Published)
The purpose of the study was to analyze NABTEB 2013, 2014 and 2015 Chemistry multiple choice test items for item parameter invariance using item response theory. An evaluation research design was adopted for the study. Unidimensionality test was conducted to see to the IRT statistical assumption being satisfied before further analysis was carried out. The IRT statistical software -eirt – Item Response Theory Assistant for excel was used to determine the item difficulty parameter, item discrimination parameter and guessing parameter estimates. The findings from the study revealed that item difficulty and discrimination parameters were only invariant by sex in 2013 and 2015 but guessing parameters were invariant by sex in 2013, 2014 and 2015. Item difficulty parameters were invariant by school location in 2013, 2014 and 2015 while item discrimination and guessing parameters were invariant by school location in 2014 and 2015 only. Item difficulty and guessing parameters were invariant by school ownership in 2013, 2014 and 2015 but item discrimination parameter was invariant by school ownership in 2013 and 2015. Item difficulty and guessing parameters were invariant by school type in 2013 but item discrimination parameter was invariant by school type in 2013 and 2015. It was recommended that examination bodies such as NABTEB should use any of the subgroups within the population for item analysis provided such subgroups include respondents of the different levels of ability.
Empirical Investigation of Human Capital Investments and Its Effect on Economic Growth In Nigeria (1990-2017) (Published)
The study examined the empirical investigation of human capital investments and its effect on economic growth in Nigeria; for the period 1990-2017. Secondary data were used and collected from Central Bank of Nigeria Statistical Bulletin. The study used Gross Domestic Product (GDP) and was employed as the dependent variable to measure the human capital investments on economic growth in Nigeria; whereas, government expenditure on health and government expenditure on education were also used as the independent variables to measure human capital investments in Nigeria. Hypotheses were formulated and tested using Ordinary Least Square econometrics techniques. The study showed that government expenditure on education had a significant effect on Gross Domestic Product in Nigeria. Government capital expenditure on health sector had a significant effect on Gross Domestic Product in Nigeria. The coefficient of determination indicated that about 69% of variations in Gross Domestic Product can be explained by changes in government capital expenditure variables in Nigeria. The study concluded that human capital investments had a significantly effect on economic growth in Nigeria. The study recommended that Government should ensure proper management of human capital expenditure in a manner that will promote growth and development in the economy. The government and policy makers should increase its investments in health and education; since, it would increase the level of development in the economy as well as the standard of living. Government should encourage and manage the funding of the education and health sectors. The policy makers should ensure that appropriate evaluation techniques should be used for projects that will ensure that capital expenditure is not made in an extravagant manner.
Group Investigation Based Learning Improves Students’ Productive Disposition and Mathematical Power (Published)
International educational reformation has recommended the importance of investigation to enhance mathematics learning and develop mathematical power for children (Quinnell, 2010). This research used a qualitative approach involving teacher and student participation in junior high schools (state school and private school owned by an educational foundation) in Indonesia which applied group investigation based learning in mathematics class. The results showed that mathematics learning with investigation approach (group investigation) had succeeded to transform negative disposition into productive (positive) disposition and to enhance productive disposition toward mathematics and had affected the increasing of students’ mathematical power. The students’ mathematical power ability appeared in the reasoning actualization (providing reasons, mathematical communication in groups and connections between ideas in mathematics when they discussed about the investigation result. Result of this study was also in line with Flewelling and Higginson (2003) that investigation, and problem solving suggested an opportunity for students to use their imagination in order to obtain more powerful mathematics ideas and understanding about relationship between mathematical ideas.