Self-Review 4-5 The rock group Blue String Beans is touring the United States. The following chart shows the relationship between concert seating capacity and revenue in $000 for a sample of concerts. Amount ($000) 2 5800 6300 6800 7300 Seating Capacity (a) What is the diagram called? (b) How many concerts were studied? (c) Estimate the revenue for the concert with the largest seating capacity. (d) How would you characterize the relationship between revenue and seating capacity? Is it strong or weak, direct or inverse