Certify Teacher EC-6 (391) Math Practice Test 2026 – Complete Exam Prep

A histogram shows how a numeric variable is distributed by grouping data into intervals (bins) and counting how many values fall into each interval. Because the data being displayed are numbers that can be measured and ordered, they are quantitative data. Qualitative data, including categorical and nominal data, consist of category labels rather than numbers, so they are typically shown with bar charts rather than histograms. For numeric data like test scores or heights, the histogram shape reveals patterns such as skewness and spread.