Which graphical method is a line graph showing frequencies for interval or ratio data?

Which graphical method is a line graph showing frequencies for interval or ratio data?

• A. Frequency Polygon
• B. Population Curve
• C. Central Tendency
• D. Skewness

Answer: (A)

Frequency polygon is a line graph that shows how often values occur for interval or ratio data. It does this by plotting the frequency at the midpoint of each class interval and connecting these points with straight lines. This setup lets you see the distribution’s shape—where it peaks, how it tails off, and whether it’s symmetric or skewed. It’s often created from a histogram by using the class midpoints as the x-coordinates and the frequencies as the y-coordinates, then drawing lines between consecutive points (and extending to zero at the outer boundaries to close the figure). The other terms refer to different ideas: central tendency is a single summary value, skewness describes asymmetry, and a population curve isn’t the standard line-graph of frequencies.

Frequency polygon is a line graph that shows how often values occur for interval or ratio data. It does this by plotting the frequency at the midpoint of each class interval and connecting these points with straight lines. This setup lets you see the distribution’s shape—where it peaks, how it tails off, and whether it’s symmetric or skewed. It’s often created from a histogram by using the class midpoints as the x-coordinates and the frequencies as the y-coordinates, then drawing lines between consecutive points (and extending to zero at the outer boundaries to close the figure). The other terms refer to different ideas: central tendency is a single summary value, skewness describes asymmetry, and a population curve isn’t the standard line-graph of frequencies.