In statistics, the value assigned to the variable is an observation or characteristic that differs from one individual to the next. There may be more than one variable in a statistical study. Consider this statistical study: Suppose a doctor has developed a new medicine to treat migraine headaches. To test the effectiveness of the drug, the doctor gathers volunteers who experience migraines and gives a dose that varies from one volunteer to the next. During the study, when volunteers experience a migraine, they take their prescribed dose of medicine and report whether the pain level is reduced. What are the variables in this study? Choose one answer. Pain level and migraine headache Dosage level and migraine headache Dosage level and pain level

In the given statistical study, we need to identify the variables involved. Let's analyze the options: 1. **Pain level and migraine headache**: This option suggests that both pain level and the occurrence of a migraine headache are variables. However, the occurrence of a migraine headache is a condition rather than a variable that changes. 2. **Dosage level and migraine headache**: This option includes the dosage level, which is indeed a variable, but again includes migraine headache as a condition rather than a variable. 3. **Dosage level and pain level**: This option includes both the dosage level (which varies among volunteers) and the pain level (which is reported by the volunteers after taking the medicine). Both of these are variables that can change and are measured in the study. Based on this analysis, the correct answer is: **Dosage level and pain level**.