In 2018, luna had an average of 34 (SEM 6.7) trick or treaters an hour, for 4 hours. In 2019, she had an average of 42 (SEM 5.4) trick or treaters an hour, for 4 hours. Last year, 2020, she only had an average of 21(SEM 2.1) trick or treaters an hour, for 4 hours. Questions: 1. Was the number of trick or treaters for 2019 significantly different from 2018? 2. Was the number of trick or treaters for 2020 significantly different from 2018