Question 2: Suppose you manufacture paper bags. You suspect that changing the concentration of hardwood pulp in the paper will change the tensile strength of the bags. The data in Tensile gives the tensile strength (measured in PSI) at four different hardwood pulp concentration levels.

(a) Specify the appropriate hypothesis test.

(b) Run the appropriate hypothesis test in SAS or Excel.

(i) Should you reject the null hypothesis or not? How do you know?

(ii) Which, if any, of the concentrations differ in a statistically significant way? Which, if any, of the concentrations do not differ in a statistically significant way? How do you know?