Bobby collects data from 30 adolescents on the average minutes of daily practice on the guitar and converts the data to ranks. He wants to know whether age (13-15 or 16-18) is related to practice time. His alternative hypothesis might state ______. Group of answer choices there will be no difference in guitar practice times for older and younger adolescents there will be a difference in the sum of ranks for older and younger adolescents there will be no difference in the sum of ranks for older and younger adolescents there will be a difference in guitar practice times for older and younger adolescents