Techniques to analyse Google Analytics to arrive at the right Test Devices required for Web Testing

I work for an Asset Management firm and trying to estimate the testing effort for a website. For compatibility testing appropriate test devices needs to be used. As an initial prep, have contacted the Marketing team to get the Google analytics of the existing site based on the Browsers, Devices etc..

I am wondering if there are any techniques that can be followed to analyse the reports received from the Marketing team to arrive at the right Test Devices that can be used for testing.

Post this have to plan if any devices needs to be procured.

Thanks