Ashareholders' 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 7.56 years for ceos with a standard deviation of s6.67 years. a. formulate hypotheses that can be used to challenge the validity of the claim made by the shareholders' group b. assume 70 companies were included in the sample. what is the p-value for your hypothesis test? enter negative value as negative number (to 3 decimals) t-value p-value ( between .025 and .05 ; c. at α = 0.02, what is your conclusion? do not rejectt ー°the null hypothesis, we don't have enough evidence to disprove the shareholder group's claim.