In order to earn a little extra money, Anna set up a lemonade stand on her block over the summer. Suspecting that there might be a relationship between the temperature and the amount of lemonade she sells, Anna recorded the day’s high temperature and the number of cups of lemonade she sold for $10$ days. After plotting her results, Anna noticed that the relationship between her two variables appeared fairly linear, so she used her data to calculate a least squares regression equation. **What was Anna's explanatory variable?** [[☃ radio 1]] **What was Anna's response variable?** [[☃ radio 2]]