A researcher says, "I want my experiment to be a success. I'm sure my hypothesis is correct, so I'll just give my subjects a couple of hints here and there. You know, maybe a wink now and then if they give a good answer. That way I'll really be able to show that my independent variable had an effect."

a. How would you convince her that her plan is faulty?

b. What is a double-blind experiment? Would you recommend that she use it? Why or why not?