These projects are not only attempts to expose you to the use of statistics.  They also serve the purpose of training you in the presentation of results.  Therefore, your grade will depend on your ability to present results in a way that will be appropriate in a business setting.  A good report will have the following characteristics:

• The report will begin with an Executive Summary.  The Executive Summary should typically be less than one page in length.  The Summary will describe the problem that was investigated and the sample that was used in this investigation.  The summary will include findings and recommendations.
• The body of the report will include your analysis.  It should include charts as they are appropriate to your explanation of your results.  A good report always describes the data set so that the reader understands how the data were gathered and who the subjects are.  The report itself should not contain any statistical jargon.   The rule that we use is that "your mother should understand your report."   You must show that you can translate statistical findings into everyday language.   A good report concludes with recommendations.
• Your statistical analysis should be presented in an appendix to the report.  It should be clear to the reader how you arrived at the conclusions in the body of your report. 

The biggest single mistake that is made by groups is assigning certain parts of a report to individual group members and then putting the report together at the last minute.  Sometimes, conclusions in one section are not consistent with conclusions in another section.  Sometimes, the tone of the report differs from section to section.   Sometimes, it is done in different typefaces.  All of these distract from the overall quality of the report.  Each group member is responsible for the quality of the entire project.  Do not allow mistakes in one part to drag down the whole group.   Do not put off your project until it is not possible to correct mistakes that are made by another group member.

I have put together a number of tips for project reports.