Two processes in a manufacturing line are performed manually: operation A and operation B. A random sample of 50 different assem
blies using operation A shows that the sample average time per assembly is 8.05 minutes, with a population standard deviation of 1.36 minutes. A random sample of 38 different assemblies using operation B shows that the sample average time per assembly is 7.26 minutes, with a population standard deviation of 1.06 minutes. Required:
For α = 0.10, is there enough evidence in these samples to declare that operation A takes significantly longer to perform than operation B?
The equation of a line which has the slope m and passes through the point A(x1,y1) has the formula: y-y1=m(x-x1) in your case m= -5 ; A(x1;y1)=(1;-1) y-(-1)= -5(x-1) y+1= -5(x-1) answer is c