Suppose a researcher is interested in examining the effects of mood and food deprivation on eating. Female participants listen to one of two types of music to induce either a happy or a sad mood,...

Suppose a researcher is interested in examining the effects of mood and food deprivation on eating. Female participants listen to one of two types of music to induce either a happy or a sad mood, following either 19 hours of food deprivation (breakfast and lunch are skipped) or no deprivation. The participants are then given free access to food in a controlled laboratory setting, and the amount of food consumed is measured for each individual.

How many independent variables or factors does this study have? What are they?