Question 9 2 pts A business receives supplies of copper tubing where the supplier has said that the average length is 26.70 inches so that they will fit into the business' machines. A random sample of 48 copper tubes finds they have an average length of 26.75 inches. The population standard deviation is assumed to be 0.15 inches. At a=0.05, should the business reject the supplier's claim? Homework Help 6VC. Hypothesis test example, population standard deviation (3.35)