According to an IHS Markit study, the average length of new-vehicle ownership in the U. stands at 79.3 months , or nearly seven years with a standard...

79.3 monthsYou have sampled 41 owners of new Mercedes Benz and found a mean length of ownership of 81.9 months. Test to determine if Mercedes' owners hold onto their car longer than the average for all brands using α = 0.025 and the prob-value approach.