Can anyone help this problem, thank you very much.

In the experiment in Gottschalk, Mimra, and Waibel, 2019 \"Health Services as Credence Goods: A Field Experiment,\" (ETH Zurich working paper), the authors ran a eld experiment to test if dentists would provide excessive treatment. v) What manipulations in the 2X2 design were used on the test subject to present himself to dentists? (4 points). vi] How are average excessive treatments related to these manipulations? (4 points)