Instructions: When asked to perform a hypothesis test, use a = 0.05 unless otherwise stated. When possible, all hypotheses must be stated using parameters. Certain people become addicted to their cell phones, and have to take drastic measures to reduce their screen time. To meet this demand, a market for out-of-date flip phones has emerged. These old-style phones are cheap to mass-produce, and a flip phone manufacturer designs an experiment to learn how to maximize the number of flip phones sold. Advertisements were sent in a targeted mailing to a set of phone addicts, communicating that a limited line of flip phones would be available for the next 30 days. Half of the ads featured a glossy photo of a flip phone, while the other half featured large lettering saying "No Screen!" The mailings were sent in balanced fashion to addicts in the following annual income brackets: < $30,000, $30,000 - $70,000, > $70,000. When responding to the ads, phone purchasers were required to provide their address and income data. After the 30-day period, a text file containing the data from this experiment was finalized. a) What is the response variable in this experiment? b) Name any factors involved in this experiment. c) What term would an expert in experimental design use to describe the values <$30,000, $30,000 - $70,000, and > $70,000? d) Any individual advertisement is printed, and sent to a potential purchaser. What experimental design term describes the sending of a single ad, and the subsequent purchasing behavior?