[0/4 Points] DETAILS ASWESBE9 9.E.028. You may need to use the appropriate technology to answer this question. A shareholders' group, In lodging a protest, claimed that the mean tenure for a chief executive office (CEO) was at least nine years. A survey of companies reported In The Wall Street Journal found a sample mean tenure of x = 7.27 years for CEOs with a standard deviation of s = 6.38 years. (a) Formulate hypotheses that can be used to challenge the validity of the claim made by the shareholders' group. HO: HS 9 OH : H > 9 Ho: H = 9 OH,: H $ 9 HO: H 9 HHS9 (b) Assume 90 companies were included in the sample. What is the test statistic? (Round your answer to three decimal places.) What Is the p-value for your hypothesis test? (Round your answer to four decimal places.) p-value = (c) At a = 0.01, what is your conclusion? Do not reject Ho. We can conclude that the mean tenure of a CEO is significantly lower than 9 years. The claim of the shareholders group is not valid. Reject Ho. We cannot conclude that the mean tenure of a CEO is significantly lower than 9 years. The claim of the shareholders group is valid. Do not reject Ho- We cannot conclude that the mean tenure of a CEO is significantly lower than 9 years. The claim of the shareholders group is valid. Reject Ho. We can conclude that the mean tenure of a CEO Is significantly lower than 9 years. The claim of the shareholders group is not valid