Question

which of the following is the dependent variable? national sleep foundation sleep duration recommendations sleepfoundation.org | sleep.org age hours of sleep recommendation (recommended, may be appropriate, not recommended) male or female

Explanation:

To determine the dependent variable, we analyze the relationship between variables. The dependent variable depends on another variable (the independent variable). In the context of sleep duration recommendations, "hours of sleep" depends on the age group (the independent variable here). Age, recommendation type, and gender (male/female) don't depend on hours of sleep in this context. So the dependent variable is hours of sleep.

Answer:

hours of sleep