Recall the differences between the terms quantitative and categorical. Quantitative data use numeric values to indicate how much or how many, such as the number of courses taken a semester or the number of pets someone has. Categorical data can be grouped by specific categories such as courses or pet type. The question posed here is about the responses to the question " how soon do you think driverless cars will be commonly used in the [United States]?" A histogram was constructed according to the possible responses given: within 5 years, in 6–10 years, in 11–15 years, in 16–20 years, longer than that, or don't know.