An analysis of the effects of sand casting process parameters on the ultimate tensile strength of an aluminium alloy sand casting based on the Analysis of variance (ANOVA) technique is proposed in this paper. While other casting parameters were kept constant, the selected parameters were varied and the cast specimen tested to obtain their ultimate tensile strength. Formulation of the varied effects was then made and a statistical tool selected for the analysis. The result of this work shows that the selected technique is an effective tool for analyzing sand casting process. The computed treatment mean square, response mean square and error mean square are 456.35, 57.57, and 59.8 respectively. It is concluded with 90% confidence that the mould temperature is the most significant factor which influences the casting quality in terms of strength under the specified conditions.