What type of object can offer the  mosteffective way to display data and calculations in a presentation?  

A graph or a table.

You can use a graph or a table to make the point much stronger than just describing the data. A graph can be used to represent one of more sets of data graphically. A table in this case as compared to a graph is less effective because it only shows the data whereas the graph shows an interpretation of data. However, you can use a table from an excel sheer to enter raw data and make some complex and simple calculations.

answer///radio frequency interference (rfi);