The normal distribution is a convenient modeling tool for processes in the natural and social sciences. Furthermore, due to the Central Limit Theorem the family of normal distributions represents a crucial class of theoretical distributions which are widely used in inferential statistical work. However, students usually experience difficulties when first dealing with inferential procedures. A “visualization” tool for basic concepts such as the P-value, alpha- and beta-errors can be usefully provided in order to improve the students’ understanding. Microsoft Excel is a useful graphing tool and can be helpful for the exploration of this important topic in a Probability and Statistics course. The authors demonstrate how interactive graphs can be used to illustrate properties of normal distributions, including the standard normal distribution, and to visualize the nature of the quantities involved in statistical calculations and procedures.