Question

Which diagram is the best representation of the incidence of a disease across different points on a timeline?

• A. Histogram
• B. Line diagram
• C. Scattered diagram
• D. Bar diagram

Hint:

Think about which chart joins points to show a trend over time.

Answer 1

The Correct Option is B

Step 1: The question asks for the chart that best shows how disease incidence changes over time. The key requirement is a continuous time axis on which a trend can be read.
Step 2: A line diagram plots values against time and joins them, so it clearly displays the trend of events with the passage of time and how the frequency of a variable rises or falls over the timeline.
Step 3: The distractors are weaker. A histogram shows frequency distribution of a continuous variable, a bar diagram compares discrete categories, and a scattered diagram shows correlation between two variables - none of these is designed for a time trend.
Step 4: Hence the line diagram is the best choice for incidence over a timeline.