Question 6 4 pts A company advertises that the mean life of its furnaces is more than 18 years. We want to seek evidence from a company by selecting a sample of 300 furnaces. a) The parameter of interest: (Type the capital letter from options below) A Single mean B Single proportion C Difference in means D Difference in proportions E Correlation b) Choose the correct hypothesis test (Type the capital letter from options below) A Hoit = Hz F Ho: P1 = Pz Hail > uz Ha:p > Pz B Ho: u = 300 G Ho:p = 18 Hail > 300 Ha:p > 18 C Ho: H = 18 H Ho: H = 18 Hail 18 D Hold = 18 Hop = 18 Ha:x > 18 Haip 300 Haip > 18