Now let's say the researcher not only looked at high dose of Vitamin C but also included different amounts of water participants were to drink (0, 500, or 1000 ounces per day).

Now let's say the researcher not onlyr looked at high dose of Vitamin C but also included different amounts of water participants were to drink (0, 500, or 1000 ounces per day). Response Variable: Explanatory Variable: Factor: Levels: Observational Unit