Plot the data as two seperate series. Now, the trendlines would be for
weeks 1-6 and 7-12 respectively. Using two series would also make
sense since the data represent potentially different events.

--
Regards,

Tushar Mehta
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions

In article <0CA7938B-2FB1-4E34-94B2-309A6CA74BAC@microsoft.com>,
Elizabeth@discussions.microsoft.com says...
> Hello. I am working on a line chart that shows 12 weeks of data for homework
> completion. The X axis is weeks and the Y axis is rate of completion. Weeks
> 1-6 were baseline and data was collected for completion. Weeks 7-12 were
> experimental where an intervention was used to influence homework completion.
> I would like to be able to insert a trend line for weeks 1-6 and a separate
> trend line for weeks 7-12 on the same graph to compare student performance.
> Right now, when I right-click on a data point in my grapn to create a
> trendline, I get a trendline for all 12 weeks of data. Can anyone help me
> create two seperate trendlines? Thanks
>
> Elizabeth
>