The histogram below represents the number of television sets per household for a sample of U.S. households. How many households are included in the histogram? 
Definitions:
Case Study
An in-depth analysis of an individual, group, event, or situation to explore and understand its complexities.
Correlational Method
A research method that examines the extent to which two variables are associated.
Experimental Method
A research methodology that manipulates variables to determine cause and effect relationships, often through controlled laboratory studies.
Longitudinal Study
A research design that follows the same subjects over a period of time, allowing for the observation of changes or development.
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