Monthly Malaysia crude oil production data for the period of January 2005 to May 2010 were analyzed using time-series method called Autoregressive Integrated Moving Average (ARIMA) model. Autocorrelation and partial autocorrelation functions were calculated to examine the stationarity of the data. Then, an appropriate Box-Jenkins ARIMA model was fitted. Validity of the model was tested using Box-Pierce statistic and Ljung-Box statistic techniques. The predictability of future crude oil production as a forecast is measured for three leading months.
Most programs at the university level require completion of mathematics courses. To survive inuniversity, those who are taking mathematics courses should succeed in their examination so that this canbe a path for them to proceed smoothly in their study. This research investigates the factors contributingtowards achievement in mathematics at a public university. The identified factors are students’ attitude,student-centered learning and classroom environments. The data was collected randomly from 86students who took business mathematics course in 2018 through a distribution of questionnaires. Thisstudy focused on the measurement model and structural model of Partial Least Square analysis. Thefindings indicate that students’ attitude most significantly affected the achievement in mathematics,followed by students’ centered learning. Meanwhile, classroom environment is found as an insignificantfactor of the achievement in mathematics. As a conclusion, students’ attitude is the most influential factorin mathematics achievement compared to students’ centered learning and classroom environments.Therefore, the management of higher education should focus on the empowerment of students’ attitudetowards mathematics subject and improve the quality of student-centered learning at the university. Keywords: achievement in mathematics, students’ attitude, student-centered learning, classroom environments, Partial Least Square
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