Researchers are studying the relationship between honesty, age, and self-control conducted an experiment on 160 children between the ages of 5 and 15. The researchers asked each child to toss a fair coin in private and to record the outcome (heads or tails) on a paper sheet, and said they would only reward children who report heads. Half the students were explicitly told not to cheat and the others were not given any explicit instructions. Differences were observed in the cheating rates in the instruction and no instruction groups, as well as some differences across children's characteristics within each group. Identify the population of interest in the study. a) 80 children between the ages of 5 and 15 who were told not to cheatb) 160 children between the ages of 5 and 15c) The researchersd) All children between the ages of 5 and 15