What term describes a graph plotting observations on the x-axis and frequency on the y-axis?

What term describes a graph plotting observations on the x-axis and frequency on the y-axis?

• A. Histogram
• B. Frequency distribution
• C. Scatterplot
• D. Bar chart

Answer: (A)

This question targets how a histogram represents distribution. In a histogram, the x-axis shows the values of the quantitative observations, grouped into bins or ranges, and the y-axis shows the frequency (how many observations fall into each bin). The bars are typically touching, reflecting continuous data, and their heights indicate the number of observations in each value range. This matches the description of plotting observations on the x-axis and frequency on the y-axis. A scatterplot would require two variables and plot individual data points, not frequencies by value ranges. A bar chart compares distinct categories with gaps between bars, not continuous value ranges. A frequency distribution can be presented as a table or chart, but the graph described is specifically a histogram.

This question targets how a histogram represents distribution. In a histogram, the x-axis shows the values of the quantitative observations, grouped into bins or ranges, and the y-axis shows the frequency (how many observations fall into each bin). The bars are typically touching, reflecting continuous data, and their heights indicate the number of observations in each value range. This matches the description of plotting observations on the x-axis and frequency on the y-axis. A scatterplot would require two variables and plot individual data points, not frequencies by value ranges. A bar chart compares distinct categories with gaps between bars, not continuous value ranges. A frequency distribution can be presented as a table or chart, but the graph described is specifically a histogram.