When Water Flows Across Farmland, Some Soil Is Washed Away

Multiple Choice

When water flows across farmland, some soil is washed away, resulting in erosion. An experiment was conducted to investigate the effect of the rate of water flow (liters per second) on the amount of soil (kilograms) washed away. The data are given in the following table: The association between flow rate and the amount of eroded soil is:

A) positive.
B) negative.
C) neither positive nor negative.
D) impossible to determine, because both variables are categorical.