Hint(s) Check My Work A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive officer (CEO) was at least seven years. A survey of companies reported in The Wall Street Journal found a sample mean tenure of T = 6.43 years for CEOs with a standard deviation of s = 6.35 years. a. Formulate hypotheses that can be used to challenge the validity of the claim made by the shareholders' group. Ho : H 2 Ha : H b. Assume 85 companies were included in the sample. What is the p-value for your hypothesis test? Enter negative value as negative number. t-value (to 3 decimals) p-value greater than 0.20 c. At a = 0.05, what is your conclusion? enough evidence to disprove the shareholder group's claim. Do not reject the null hypothesis. We | don't have