=+39. Sales by region. A sales manager for a major pharmaceutical company analyzes last year’s sales data for her 96 sales representatives, grouping them by region (1 = East Coast United States; 2 = Mid West United States; 3 = West United States; 4 = South United States; 5 = Canada;

6 = Rest of World). She plots Sales (in $1000) against Region (1–6) and sees a strong negative correlation.