I am analyzing the accuracy of different clinicians when it comes to providing presumptive diagnoses. I am comparing dentists and physicians for accuracy of referrals. My data is as follows: 33 cases the MD diagnosed correct, 14 cases the MD was incorrect. 115 cases the DDS diagnosed correctly. 76 cases the DDS was incorrect.

Is there a statistical difference between these two groups? How would I calculate that using Excel?

Correct Incorrect   

MD 33 14
DDS 115 76