2. Suppose than an instructor want wants to investigate whether the font used on an exam affects student performance as measured by the final exam score. She uses four different fonts (time , courier, helvetica, comic sans ) and randomly assigns her 40 students to one of these four fonts. a. Identify the explanatory and response variables in this study. b. Is this an observational study or a randomized experiment? Explain how you know. c. Even though the subjects in this study were not randomly selected from a population, its still appropriate to conduct an analysis of variance .Explain why