MKF 2121 MINI TASK 7Yingchao Han 285850701. For each of the research questions (RQ) posed below, formulate the null and alternative hypothesis and suggest the appropriate statistical test. a. Consumer preferences for Dove soap were obtained on an 11-point Likert scale. The same consumers were then shown a commercial about Dove. After the commercial, preferences for Dove were again measured. Is the preference after viewing the commercial different from the preference before? b. Respondents in a survey of 1,000 households were asked to indicate their frequency ofdomestic air travel on an interval scale. They were also classified as being in high-, medium-, or low-income groups. Does the frequency of domestic air travel differ across households of different income levels (groups)?