Representative data read from a plot on runoff sediment concentration for plots with varying amounts of grazing damage, measured by the percentage of bare ground in the plot, are given for steeply sloped plots.
| Steeply Sloped Plots |
| Bare ground (%) |
7 |
7 |
14 |
21 |
28 |
35 |
28 |
42 |
49 |
56 |
49 |
| Concentration |
120 |
300 |
360 |
720 |
600 |
600 |
1080 |
960 |
1320 |
1440 |
1200 |
(a) Using the data for steeply sloped plots, find the equation of the least-squares line for predicting y runoff sediment concentration using x = percentage of bare ground. (Give the answer to two decimal places.)
(b) What would you predict runoff sediment concentration to be for a steeply sloped plot with 16% bare ground? (Round your answer to the nearest whole number.)