Pediatric researchers carried out a study on various options for treating a child's cough. A sample of 120 children who were ill with an upper respiratory tract infection and their parents...

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Extracted text: Pediatric researchers carried out a study on various options for treating a child's cough. A sample of 120 children who were ill with an upper respiratory tract infection and their parents participated in the study. On the first day, a total symptoms score in points was measured for each child (higher indicating worse symptoms). That night 40 randomly selected children received dextromethorphan (DM, over-the-counter cough medicine), another 40 randomly selected children received a dosage of honey, and the remaining 40 were given no dosage at all. On the second day, the total symptoms score in points was measured again for each child and the improvement score was computed (improvement = %3D day 1 score - day 2 score). 1. This study is an experiment [ Select ] a categorical explanatory variable 2. For this study, the variable improvement score is v a quantitative response variable a quantitative explanatory variable a categorical response variable Roxplote by Groun