Levels of an independent variable and two levels of a moderator variable.

  Form a hypothesis about an email campaign for a favorite new or existing product with two levels of an independent variable and two levels of a moderator variable. For example, a hypothesis might be: “An email campaign for a firm that sells outdoor gear will convert (i.e., cause a customer to finalize a purchase) more with a subject line with a promotional message plus call to action (e.g., ‘50% Off our Top of the Line Jackets. Buy Now!’) than one with a promotional message without a call to action (e.g., ‘50% Off our Top of the Line Jackets.’) BUT ONLY if the subject line is a price promotion (e.g., ‘50% Off our Top of the Line Jackets.” versus “Top of the Line Jackets.’).”