In 2021 hybrid vehicles were found to have 3475 fires per 100 , 000 vehicles which is more than any other vehicle type. Researchers decide to pull a sample of 1000 of the newest hybrid vehicles to determine the proportion that have had a fire. (a) What is the parameter of interest? The proportion of hybrid vehicles in the sample that have caught fire The proportion of all new hybrid vehicles that catch fire The proportion of all vehicles that catch fire The proportion of vehicles in the sample that are hybrid (b) p = Round answer to four decimal places