Question

Nico measured the water level in his pool every other day for two weeks.
Which statement best describes the information shown by the scatterplot and trend line.
mc009-1.jpg
As the number of days increased, the water level always decreased.
As the number of days increased, the water level always increased.
As the number of days increased, the water level usually decreased.
As the number of days increased, the water level usually increased.

Answer 1

As the number of days increased, the water level usually decreased.

The trend line slopes downward (overall decrease), but the scatter points show some small increases on certain days, so it’s not always decreasing.