A shareholders" group, in lod ging a protest, claimed that the mean tenure for a chicf cxecutive officer (CEO) was at least niae years. A survey of companies reporied in The Wall Street Joumal found a sample mean qenure of X B.AR = 7.27 years for CEOs with a standard deviation of s = 6.38 years. Assame 85 companies were included in the sample. Formulate a hypotbeses that can be ased to challenge the validity of the claim made by the sharcbolders' group. At a level of significance, a = 0.10, what is your conclusion? 2. Reject the mull; there is suifleient svidence that teriure of CEO is less than 9 yean. b. Reject the aull; there is not sulficingt evdence that teoure of CEOs is less than 9 years. C. Not enough iaformatioe provided to werk this problem. 1. Do Not Rejoct the nult: there is sutficient midence that tenure of CEOs is less than 9 ycars