Question

When water flows across farm land, 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.Flow Rate: .31 .85 1.26 2.47 3.75Eroded soil: .82 1.95 2.18 3.01 6.07The association between flow rate and amount of eroded soil is:A. negativeB. impossible to determine because both variables are categoricalC. neither postive nor negativeD. positive

Answer 1

D

Explanation:

`\left[\begin{array}{cc}Flow Rate&Eroded Soil\\0.31&0.82\\0.85&1.95\\1.26&2.18\\2.47&3.01\\3.75&6.07\end{array}\right]`

As we can see, as flow rate increases, eroded soil also increases. So the association is positive.