The study aimed at assessing how students and teachers factor taken together influence students' achievement in Statistics as well as their relative contribution to the prediction. Two research questions were raised and purposive sampling was adopted to select national diploma year 2 students since they are already in their final level in the school. All the lecturers in Statistics department and year 2 Statistics students were used for the study. Student Questionnaire (SQ), Teaching Staff Scale (TSS), and Statistics Achievement Test (SAT) were used for data collection and analyzed using descriptive and multiple regression. The results showed that the four (4) variables taken together had significant contribution to students' achievement in Statistics and accounted for 80.8% of the variation in students' achievement in Statistics. Lecturer experience and students attitude to Statistics were found to be significant but lecturer experience contributed mostly to the students' achievement in statistics. It was recommended that stakeholders in provision of Statistics education at the monotechnic institutions level must consider the four variables that contributed significantly to achievement seriously during planning for the Statistics education programmes for optimum achievement of students in Statistics.