3 pts Clear you Stay conn No phone Archaeologists plan to examine a sample of 2-meter-square plots near an ancient Greek city for artifacts visible in the ground. They choose random samples of plots from 65 No dual m floodplain, coast, foothills, and high hills. What type of study is this? No leaving ope You must O A randomized controlled experiment No Talking You must O A randomized block experiment duration o . Your webc O An observational study based on a stratified random sample remain on An observational study based on a convenience sample Additional Ru O An observational study based on a multi-stage sample