A frequency polygon is constructed by joining points located at the:
Correct answer: A. Class midpoints
- A. Class midpoints
- B. Class boundaries
- C. Cumulative totals
- D. Frequency ranks
Explanation
In a frequency polygon, each frequency is plotted above the midpoint of its class and the points are joined by straight lines. Class boundaries are mainly used to remove gaps between continuous classes.
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About Data Collection and Presentation
Data collection covers primary and secondary sources, qualitative and quantitative data, discrete and continuous variables, sampling methods and questionnaire design. Presentation includes frequency tables, grouped data, bar charts, histograms, pie charts, line graphs and cumulative frequency curves, with care over class intervals and misleading scales.
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