Which of the following traits do histograms, Pareto charts, and scatter plots have in common?

• A. They all are graphical methods for visualizing data.
• B. They all are used to display the distribution of categorical data.
• C. They all require the data to be $\mathrm{continuous}$ and $\mathrm{normally} \mathrm{distributed}$.
• D. They all display data using bars to represent frequencies.

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the purpose of each graphical method: Histograms are used to display the distribution of numerical data by grouping data into bins and showing frequencies with bars.
2. Step 2: Recognize that Pareto charts are a type of bar chart that displays categorical data in descending order of frequency, often used to highlight the most important factors.
3. Step 3: Know that scatter plots display the relationship between two numerical variables by plotting points on a coordinate plane, not using bars.
4. Step 4: Compare the options given: Histograms and Pareto charts use bars, but scatter plots do not; also, Pareto charts and scatter plots can handle categorical and numerical data differently.
5. Step 5: Conclude that the common trait among histograms, Pareto charts, and scatter plots is that they are all graphical methods for visualizing data, regardless of the data type or specific display style.