A SURVEY REVEALS THAT THE 100 PRIVATE CARS THAT CONSTITUTE A RANDOM SAMPLE, DRIVED AT AN AVERAGE OF 12,500 KILOMETERS DURING A YEAR, WITH A STANDARD DEVIATION OF 2,400 KILOMETERS. BASED ON THIS INFORMATION, DOCIMATE THE HYPOTHESIS WHERE, ON AVERAGE, PRIVATE CARS DRIVED AT 12,000 KILOMETERS. FOR A YEAR AGAINST THE ALTERNATIVE THAT THE AVERAGE IS HIGHER. USE THE 5% LEVEL OF SIGNIFICANCE.