Decline, in a statistical context, most nearly means

• A. a downward slope
• B. a rise in numbers
• C. a fall in the number of something; a reduction
• D. an increase

Answer: (C)

Decline in statistics refers to a reduction in the quantity being measured. When you hear there is a decline in something, it means the numbers have fallen compared to before—a fall in the number of items, people, or occurrences, i.e., a reduction. It’s about the amount decreasing, not the direction of a graph or the rate of change. The other ideas describe an increase (more, higher numbers) or a graphical feature (a downward slope) that may accompany a decline but does not define the term itself. So the best fit is a fall in the number of something; a reduction.