He should research on the cost of living in each location
Answer:
Following are the solution to the given question:
Step-by-step explanation:
Confidence Interval for both the percentage of all x-ray machines
p = the machinery's share is not working:

Lower
Confidence interval = p - error margin
Upper
Confidence Interval = p + error margin
So,
Confidence Interval 
<span>Substituting x=0 , we get
2*0+3y = 6
3y=6
y=2 is the y intercept.</span>