In this assignment, you will practice analyzing data from an experimental display advertising campaign run by a retailer. The display advertising experiment was run over two weeks. Prior to the experiment, a list of 576,344 subjects was created for the experiment and these subjects were divided equally and randomly into Treatment (Test) and Control groups. During the experiment, these subjects were tracked on a set of websites. If a subject in the Treatment group appeared on one of these websites, she was shown a display ad for the company. Likewise, if a subject in the Control group appeared, she was shown a PSA (public service ad). Some subjects appeared multiple times and were shown multiple company ads or PSAs; however, some subjects in both the treatment and control groups did not appear at all at this set of websites for these two weeks (something that often happens in reality) and these subjects could not be shown any company ads (for the Treatment group) or PSAs (for the Control group). Sales were tracked for the online and offline channels of the company for two weeks during