This dataset contains information on respondent attitudes towards a company after viewing one of four different advertisements. Advertisement 1 shows the company as a "pioneer of industry standards in social responsibility". Advertisements 2-4 use various forms of sex appeal to attract customers.

In order to best answer the company's question, you decide to carry out a formal hypothesis test. Answer the following questions to construct and implement your test. You will be using a significance level of 0.05

What are the assumptions needed to test for a difference between the advertisement types? Are these assumptions met?