Dear Diana and Tom,
Try to stay positive as schools will invite folks to interview up until the last possible minute. Perhaps you will receive your interview invitation soon? I agree with Tom that it is unlikely the GMAT score, alone, is the reason for one person to receive an interview over another. Evaluations are holistic and many components are taken into account. Without seeing all of the applications, it is truly difficult to assess why one person received an interview over another. I do encourage you to contact the admissions office to inquire on your application and make sure it is there in its entirety. If the application is not complete, then that could be why you have not heard anything. It also gives you an opportunity to ask when interview invitations will go out and perhaps you can determine if one will be coming.
Best of luck,
Lisa