Aresearcher is looking at the impact that television has on children. children are placed in a room with a variety of toys and a television playing a cartoon. the researcher predicts that the children will spend more than half of their 30 minutes looking at the television. the researcher tested 15 children and found a sample mean of m = 17 minutes spent watching the television with ss = 79. in order to test this hypothesis, what does the researcher need?