The social media marketing team for a large clothing company has developed a series of new Facebook ads. Before they release the ads, they want to know how the ads impact potential customers' opinions of their brand. They have designed a research study in which 60 potential customers will rate their opinions of the brand before and after being presented with the Facebook ads. For each customer, Ed = Cpost - pre- In other words, their change in opinion is measured as their post-presentation rating minus their pre-presentation rating. Which of the following sets of hypotheses should they use to determine if ratings increased from pre- to post-presentation? O Ho : Ha = 0 Ha : Hd >0 O Ho : Hd >0 Ha: ud 0 O Ho : Ha # 0 Ha: Hd = 0 O Ho : Hd FO Ha : Hd # 0