The next two questions are related (#1, 2): Nike was interested in whether the sales of their XOXO shoe model would increase in California after the launching of a commercial showing the Los Angeles Lakers basketball team wearing them. Nike recorded the sales of their XOXO shoe model in California every month for six months before the commercial. The commercial aired for three months. Then, after the commercial aired, Nike recorded the sales of their XOXO shoe model in California every month for another six months. 1. What type of study did Nike conduct? * a. Interrupted time-series design b. Correlational design c. Ex-post-facto design d. Pretest-posttest design e. Factorial design