A team at a popular magazine was formed to increase subscrip…

A team at a popular magazine was formed to increase subscription response rate to direct mail offers. The team has identified eight factors in the design and mailing of the offer that could potentially affect response rate. Which tool should the team use next in order to understand the cause & effect relationship between the eight factors and subscription response rate?

A manufacturer is analyzing whether the viscosity of its deo…

A manufacturer is analyzing whether the viscosity of its deodorant product varies by supplier of the powdered wax ingredient. There are two suppliers. An experiment was run, with twenty (20) samples from each supplier. Assume the variance in viscosity is equal for both suppliers. Which statistical test should be used to determine whether the mean viscosity from Supplier 1 is the same as the mean viscosity from Supplier 2?