1. A method of presenting an analysis of enterprise wide business data, the enterprise wide business data collectively stored in a plurality of data repositories, comprising the steps of: collecting transactional data from the plurality of data repositories into warehouse data stored in a uniform format in a data warehouse; in response to a first user request to a web site operable to access said warehouse data and to provide statistical analysis, including six sigma analysis of said enterprise wide business data, transferring an electronic document to said user, wherein said electronic document allows said user to select parameters for a data set in said enterprise wide business data and a performance measure to be analyzed for the data set defined by the parameters; in response to a second request from said user to said website, performing statistical analysis including six sigma statistical analysis of said performance measure for said data set according to said parameters; transferring results of said statistical analysis to said user, said results including a histogram and an indicator of a target limit specified by said user, wherein an area of the histogram outside the target limit is highlighted so as to differentiate the area of the histogram outside of the target limit from the area of the histogram inside of the target limit, and wherein a relative number of defects are graphically visible with the results; in response to an electronic request from said user to said website, running a simulation to determine the effect that varying a statistical parameter specified by said user of a plurality of statistical parameters has on another statistical parameter; and electronically transferring the results of said simulation to said user over a communications network, wherein the user is presented a graphical display providing information to assist in quality improvement.