Customer Satisfaction Surveys

An air-conditioner supplier employs four technicians who visit customers to install and provide maintenance for their air-conditioner units. In an after-visit questionnaire the customers are asked to rate their satisfaction with the technician. DS gives the ratings obtained by the four technicians over a period of time. Is there any evidence that some technicians are better than others in satisfying their customers?

How can I solve this problem using R? Help me plz!

DS:

'Technician','Rating','Frequency' 1,'Completely Satisfied',73 1,'Somewhat Satisfied',22 1,'Not Satisfied',3 2,'Completely Satisfied',64 2,'Somewhat Satisfied',42 2,'Not Satisfied',9 3,'Completely Satisfied',51 3,'Somewhat Satisfied',11 3,'Not Satisfied',1 4,'Completely Satisfied',71 4,'Somewhat Satisfied',6 4,'Not Satisfied',2