Verizon Wireless wants to test new package deals. They are considering offering three levels of data per month (5 Gb, 10 Gb, Unlimited) and two different international calling options (no international calling, discounted international). They randomly assigned 10,000 customers to receive an offer for each of the six cells corresponding to all combinations of data and international calling. The outcome was the number of customers converting to the offer. Results appear in the table below.

a) Does this experiment satisfy the principles of good design?

b) Is there an interaction effect?

c) Interpret the results in managerial terms.

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Data Plan 5 Gb 10 Gb Unlimited No International 200 300 500 Discounted International 300 500 1000 International