Dr. Batrs wants to know whether there is any change in the sugar level(non fasting) of diabetic patients living in New Delhi after the treatment provided to combat the same. The data given below represents the sugar level before and after the treatm,ent. Measurement (in mg/dL) were taken immediately prior to the treatment and after completion of the treatment.

patient before after

1 200 150

2 190 140

3 220 140

4 180 130

5 170 130

6 170 120

7 180 140